the image of bolt...
the tail is a bit too rounded at the end

sonics left shoulder overlaps his face for some reason but other than that these are pretty good if your just going from MEMORY

It's supposed to overlap his face because he is stretching his arm out in front of him, The sonic x animations are done using seperate assets, they have a new layer for every limb meaning that things will overlap. :D thanks for the comment though... Ps, i used a reference for the folds on the gloves, but yes, the rest is from memory (loved sonic since i was 5 lol)

The thick and sharp outlines and soft shading I don't think go together. In what software did you create these?

Paint, then export to GIMP

That's just the style I adapted, but hey, I'm no professional lol

I see what you're going for, but that isn't that best way to do it.
If you're trying to use a sharper vector based program for outlines, I'd recommend you use Flash (if you have it, that is).

yeah, I don't have flash ._. lol

The tail is a bit rounded at the end.

Tail? which picture? .-.

I'ma do something I ain't neva dun befohr

Well you're a pretty damn good artist! I'm 'ma art request...

thanks :D