I recently acquired Photoshop and after a few false starts, I think I've gotten the hang of it now. I managed to have a sit down and just started sketching, seeing what came out. These are some of the ones I felt were worth keeping and sharing. Still haven't quite got the hang of shading, can be a bit hit and miss, but that's all part of learning.

First off I decided to experiment on myself, a bit of growth with one of my favourite types; bursting up into the next floor and having your pecs just bulge out in front of you ^_^