I have so much trouble drawing hands... but transformers hands take the cake. I think it's the weird forshortening you have to do on them. Same with their limbs... that's why my pics don't have a whole lot of fore shortening or detail to them. XD
Anyway. I built a 3d model of a transformer/mecha hand to help me draw and thought I'd post some of the renders to help other people as well. I put it in stock, but it's really intended as a drawing reference. I suppose you could do image manip with them but it's not really made for that(black background will swallow up shadows). At any rate have fun~
If people like this, I'll be happy to do some more poses or renders. :3 just ask.