Looks cool, and yeah you should add a background story to this one. And maybe it's just me, but does the alternate shield head look like The Rock? ha ha

I like what you have here, it looks like a pretty bad bum figure! If this is your own concept you should tell us a little bit about the character, like "whats that cool weapon about?!" and what powers/abilities/skills does he have.
The only other thing I might add is that the skin tone between the head and arms are drastically different. I think you might want to apply your painting here. There are some really great walkthroughs on the site should you need a little extra outside research.
Welcome to the realm keep them coming!