Really good composition! The BG color choice was a wise one, because it helps complement Iron Man while also having it's own personality (without outshining the main object). You somehow managed to blend the art deco style with Iron Man's contemporary look (I don't dare to say post-modernist). Great work!
I was losing control over my body functions seeing this. Your combination of art deco and all our favourite comic heroes is simply stunning. Breathtaking. Awesome. Congratulations to this masterpiece (and the others in your gallery). Great!