Sketchasaurus' Sprite Stuff

[Chutzpar]

His left (our right) leg should have more shadow on it, I think. Judging by how you've shaded the rest of the sprite, the lightsource is at the top-left, but the shading on the left leg suggests there's light hitting it from the right. There should be some shadow obscuring it from its "shell", so most of it should at least be using your middle value, I think.

Also, I don't know if you're still working on this:

but there's a couple general pointers I wanted to bring up.
Firstly, it might just be because my monitor's pretty dark, but there doesn't seem to be enough contrast on his jacket and boots; I really had to squint to make out the shading!
Secondly: unless I'm very much mistaken, it looks like you're using completely desaturated colours for your blacks and the white piping on his jacket. Don't do that. It completely kills any sort of unity your colour-scheme has; give it the teeniest red tint and it'll pull the whole sprite together more and make it seem less flat.
You could give it a slightly blue tint if you want it to contrast with your oranges, but because there's just so much black, it strikes me that going for a analogous colourscheme would be the better option. If in doubt, try both :V