I agree - I would also rethink your pose a little - the original looks active/forward-leaning, while yours appears to be squatting/leaning back a little bit, makes him looks a little less heroic/dynamic. I would make the waist a smidge higher too, so you could have slightly longer legs. The belt looks a little washed out, and the hands are kind of muddy. His visor looks very thin, a thicker visor would be more appealing I think. Regardless, very nice start!