That's pretty good.  I love the colors and the cartoony feel to it.  My only critisism is that the sword looks a little odd in his hand, but besides that it's a nice piece of work.  Good job!

 This is very well done.  It looks amazing!  My only complaint would be that the lava looks too simple, but even that is debatable.  Nice work!

This is really good.  The shading is well done and the background is a really nice touch.  Good work!

I like it, it's nice and simple.  Good work.

 Not bad, I like it. :D