I'm creating a Cocos2d/Box2d side scrolling game for the iPhone/iPad and need a hero character but thought I would first find out what kind of art I need and whether or not I can do it myself using Opengameart models?

The game concept is based upon archeology, so an Indiana Jones type character would suit it.  I also like the style of Devil Dark: the Fallen Kingdom.

The character needs to walk, dig, climb a ladder, use a pick axe and show some basic expressions.  He doesn't have to be spectacular because his actions are secondary to the rest of the game (i.e., the stuff he finds on a archeological dig site).  He may occasionally bump into a creature he has to fight but again it doesn't have to be spectacular.  He will also need a shovel and pickaxe.

I can use Cocos2d actions and SpriteHelper to do the animations. 

Any suggestions/recommendations are much appreciated.

Also, are there any restrictions to using Opengameart for a commercial project?