I agree also,, you really need to work on that greenstuff, which will be even more noticable once you add paint. Other than that though I love the way you made him look.
Try smoothing out your GS a little better. All those bumps and gobs will really show up when you paint it. I think the Power Klaw looks TOO big and the big gobs of GS holding the spikes needs to be toned down some.