I'm making some sort of an alien. Currently it looks like a Zergling mated with a Sathanas...

It's not done, obviously. I plan to give it some hardened plates ( "armor" ), revise the tail considerably, re-attach those little spikes (they were attached in an earlier version), give it some sort of "face" (not very human-looking), somehow make the legs look less wiry, and maybe make those big claws into arms/"fingers" with little claws at the ends.
And then I'd do texturing and stuff like that.
Possibly-interesting note (depending how bored you are), that's per-vertex AO, not per-pixel or per-texel... I had to uber-subdivide the ground under the feet to make it look right.