the clouds are kinda confusing. they go from very dark to very light in the blink of an eye. if you look at a sunset, you notice that clouds change colors very slowly and gradually, not fast. BUT, if the clouds got light all of a sudden because of a light emitting from perseus, then you need to have him casting off VERY bright glow, because only that could effect the clouds in that way.
you also made some mistakes in anatomy. like, both wrists are far too skinny for his arm. his arm is HUGE- it's all bulging with muscle, and looks rock hard, while his wrists look girly and frail. try expanding them. the other mistake i saw with the anatomy is his right arm (the one holding the shield.) his arm is bent very funny right above his elbow. it doesn't look like muscle, but bone. to fix it, add a bulge of muscle going down into his arm gradually- no angles.
and lastly, his feet. it's hard to tell that there is in fact two of them there; it has little to no detail, and the shading doesn't match the upper body, and it doesn't seem obvious to me why.
it's good work- nice coloring. but if you fix it, it'd be even better :)
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Looks great.