The first is recognizing sprite construction and
shading styles. Most, if not all games, differ in terms of build,
color choices and shading.
Let's compare two very popular and well-made games:
The King of Fighters and Street Fighter.
Notice how Street Fighter's sprites have a bulky, muscle-bound
style, especially around the arms, and the way the clothes are
constructed to look very light and cartoony, along with the overall
shading being light. Also notice the definite difference betweek
them and King of Fighters, which goes for a more "realistic"
approach in both build and shading, and have overall darker colors.
If you were to combine these two different styles in the same
game, it would stand out pretty hard that they're not in the same
style.
The second thing is to take advantage of light
sources, one of the most important parts in both editing and full-on
customs.
When making a custom or doing some heavy rehauling on a sprite,
try to imagine where light would be hitting it in order to make
out the shades. If you need to, you can grab an action figure
and observe the way the light hits it and the shadows change depending
on the direction facing, or you can observe people around you,
but that may be a bit on the creepy/uncomfortable side.
Here's an example:
Notice the way that shadows move around as the light changes.
This is crucial in making your sprite "jump out" and
look good.
The third, and most important part, PATIENCE!
If you want the pose and design to come out the way your brain
comes up with it, you need to sprite slow so the final product
will look much neater.
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REVIEW: Be able to tell the difference between
sprites, light sources and take your time.
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Making
a Color Palette
You should have a good eye for color when making
your character's color palette. It's a good idea to make the base
colors using one of the box brushes in Paint.

Simple, no? Start off with base colors.
Now comes the tricky part; choosing a good selection
of darker, and if necesary, lighter shades of the same color.
Most spriters, whether they be beginners or elites, still have
a problem with shade choosing. You don't want to make the shades
bland, or too dark/light, you want to make them "just right."
This is very important; if you don't choose the right shades with
your palette, or if your colors are too bright, it will become
VERY uncomfortable for others to look at it.

Now we've got more shades of the same colors. If you've decided
how many you would like to use, then you can move on to your first
step in touching the sprite; recoloring.
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REVIEW: Know the colors you want to use and have
an idea how you want to shade.
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Your
First Recolor
So, you've got your knowledge, and you've got your
colors. What's next for you? Starting to rework the sprite to
the way you would like it to turn out. A good idea is to recolor
it first to get an idea on how the sprite's overall shade style
and light source are.
Let's start with something relatively easy: Mega Man.

Despite the fact that it's one of the most overused styles in
the world, it's a good choice for beginners.
Notice how the palette we made earlier was pasted into the window
for you to use in your recolor.
Microsoft Paint has a handy feature in the Eraser
tool; taking advantage of the main color and background color
choice. A quick way to recolor with it would be to select the
sprite's original color with the Eyedropper, then right-click
the color that is going to replace it. After doing so, equip your
Eraser and rub over the sprite, not with the left mouse button,
but with the RIGHT. Instead of erasing your entire product, it
replaces the colors. Pretty nifty, eh? This will be an invaluable
tool for the rest of your spritage journey. Let's start recoloring
now.

Doesn't look too bad, eh? You are most likely going to have some
leftover colors that you didn't use; keep them. You'll need them
for your edits. In some cases, you may also run out of shades
while recoloring; just make another one of that specific color
and you'll be all good. If you have any clashing colors, such
as hot pink/excruciatingly bright green and clashing shades, darken
and fix those now.
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REVIEW: Match your colors and fix anything that
is hard on the eyes. Do not remove unused shades; you may need
them later.
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Getting
To Editing
Now that we've recolored our sprite, it's time for
the best, and most time-consuming part; editing the character
to match the idea in your mind. If there are necessary details
that are not already on the sprite, be prepared to add them yourself!
To start off, grab any color that will stand out from the sprite
and outline the basic idea of what you would like to add. Start
sketching out things to remove with one color and things to add
with another.

In the case of this sprite, the helmet is there and doesn't match
the design, so I decided to sketch out some hair over it.
Don't worry about adding a bunch of excruciating detail yet, especially
with parts you had to add yourself like I did the hair; just focus
on adding the concept colors, and recoloring other parts if necessary.

Doesn't look too bad, huh? Don't stop here though; you're not
done! Now that you've got the basic construction idea, you need
to add more detail to make your sprite stand out even more. Start
shading added parts like the items that they are.

Shade clothes like they are, making sure to pay attention to your
light source. If you're satisfied with your sprite right now,
then feel free to stop here. However, if you decide you want to
expand your edit even more, go for it.
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REVIEW: Sketch in your plan, then fill color in. Add extra detail
if necessary.
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Think
Outside The Box!: Expanding Your Edits
So, you've gotten your design down-pat and slapped
onto a sprite. But what if you want more than what you are supplied
in your selected style? This is your sprite, so your opportunities
are almost infinite. Add more shades if you want to really make
your sprite stand out, or even go for resize-and-retouching. Beginners
probably shouldn't go for resize-and-retouch unless they are absolutely
confident in themselves, because it is a very long, and hard process.
Let's stick to expanding our current design for now.

Notice that a shade was added to every color as the style's detail
and shading was increased. The head was also slightly edited and
I decided to relax the eyes a bit. A small chain was also added,
and two small "wing" designs were added to the shirt.
It's small changes like this that can really make a sprite look
detailed, so take advantage of it.
Take note that the smaller the sprite, the harder
it will be to edit and add extra details. Styles such as Fire
Emblem should probably be held off until you get more experienced.
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REVIEW: Even the slightest change in the sprite can increase the
effect of your sprite.
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Now we've finished our first edit! If you want, compare the original
with your new sprite and see how much you changed.
[DARE TO COMPARE]

Now that you have the knowledge, start spriting
like crazy!
Feel free to post questions and request explanations
in
this topic if you didn't understand something in the
tutorial.
- Ashimura, the Sprite Sensei of SDB