Nice studies, reminiscent of the hulk. I like the simplicity of how you've worked these up, try focusing solely on the colour layer now and see how much form you can get in there with lighter and darker shades. Keep it up. Photoshop Phill
I've focused on human features,the simple ones that is. I had alot of problems with makin' eyes too big or nose too weird. Now i'm re-workin' my style and movin' bit by bit towards the Marvel style type of drawing.