Sprite/Art for My OUYA Game

[Vipershark]

I made all of it in photoshop

Ah, that explains a lot then!

Look at this blown-up version of your character.

See those dots all around the outline? That's Anti-Aliasing, and you want to turn it off in PS. AA causes those "blurry" dots all around your sprite, because photoshop tries to blend it into the background.
That might look okay on a light background, but when put on a dark background...

That doesn't look very nice, does it?

In addition, your sprite is using waaaaaaaaaaaay too many colors. 256 of them, to be exact, which is... well, 16 times the amount of colors that you need!

This is the palette that your sprite is using, and that's actually probably a LOWER amount of colors than are actually in your sprite because .gif files only support 256 colors.
You could do this entire sprite in 16 colors or less.
To emphasize this, look at the forward leg in the blown-up picture above. The forward leg alone has at least 8 shades (that I can actually see, it actually has a lot more judging by your palette), which is at least half the number of colors that should be in the sprite altogether!
In other words, when spriting, never use gradients, ever. ...at least not computer generated ones, as they add in a whole bunch of unnecessary colors.