CroM - I like this very very much. Your ninja is a little hard to see; while it is realistic of course (ninjas do not like to be seen!!) it weakens the piece a little. Darker clothes or higher contrast might put that finishing touch. The rope really catches my eye too, but if that is an important game thing you may want it that way. The ninja stars look too close together to me.
Arachne - AWESOME
Some thoughts:
1 - The paper windows are very bright - combined with the dark slats dividing them, its making the background very high contrast and somewhat distracting (at least to me). As I'm looking at it again though I think it may just be the wood needs to be a bit lighter...
2 - Robot Santa is awesome but is so thin in parts, a bit more of an outline here and there might help him read a bit better at 1x (looks fab at 2x tho)
3 - Ninja looks a bit offbalance to me, and its not clear whether he is in motion or not, pose is slightly ambiguous
Took me a while to find these things though, great job!
Earthpainting - great colors, great contrast, very action-packed. Maybe add an enemy? Even a dead one would help keep the piece from being too sterile. welcome!
Kren - frickin SWEET. Poses and outlines/AA need some love, but this has a TON of potential. Don't sell it short!!
