Zeus

The image is very eye-catching, but something about it feels odd. Maybe the composition is unbalanced (heavier on the right) or the planets are very "pop-out-ish." It's hard to find the focal point, except for (awkwardly enough) his package. There is a strong line of contrast down the top middle...be careful not to split your picture plane too heavily.
However, very well composited overall. :] The work displays a high level of competency. I appreciate the bottom of the picture plane where there appears to be wind blowing the dust/cloud across what Zeus is standing on. The lighting is done well--nice job matching the model lighting w/ the background and etc. Great job on the sky and how it blends into the bottom left side. Love the lighting bolt in his hand. Nice shadows.
Last thought is: What is his mission? The picture is zoomed in close enough to be very interesting, but it is not clear what he is doing...why he is pushing the concrete behind him? Is it on Earth? In space? Anyway, you may be shooting for the mysterious aspect, and you could pull it off well with this shot. Just be aware that you don't lose a viewer because they don't quite psychologically connect.
P.s. I really really appreciate that you posted your steps. A lot of people have a wealth of different knowledge about PS and it's great that you're sharing for improvement!