[C+C] Greyscale Shaded Sprite Help

[Raven Foxx]

I did a Crappy bulbasaur pixel. Ignore the line art for now. I want to make this grey scale so I know where the light is coming from. Does this look realistic?

[RunninBlood]

I think you did well on  terms of being able to read where the light comes from. The only thing bothering me (apart from the lines etc.) is the amount of lighting. His left ear and cheek have a bit to much lighting if you ask me.

[Tycho Magnetic Anomaly]

I think its pretty good, but would agree the shadow/light contrast could be a bit better defined, I had to look up an image of this character and after seeing I also thought that the contrast between the shell and body could be better also. Since its a question of shading I did not touch your line art or general detailing, I did not do much just a bit on contrast a a tiny bit of shading, try experiment around with various contrasts, i guess its tricky when your working at grey-scale.