Great drawing, lots of action going on it, I like it! Is that supposed to be smoke in the sky, or clouds? If its smoke, shouldn't it be black? Most fires I have seen were black smoke.
Really cool, but I think the composition is a bit crowded. If you give yourself more space around your focal point (the main dude) you may like it. And remember, as digital artists, we can always change things even when we're mostly finished. I would recommend expanding your canvass and fiddling around with the composition. Anyways, great stuff!