Maybe.... Zero's forehead gem looks a little odd. Perhaps if the shiny part was on top rather than the lower left side, it would look better.... But I digress. Aside from the whole Z-on-shoulder thing, it's fine.
Really nice job adding the shading and highlights on here. They look very natural, and almost blend into the original colors. I'm one of those people who has a hard time not making the shadows into *BANG* here's one color *WHACK* there's the shadow so they end up looking blocky XD
I also love the shininess in MM's helmet and the highlights in Zero's hair. The "jeweled" parts look good as well.
I love the art! ^_^ I wish I had photoshop ;_; Nut noooo <_< I don't even have a scanner >.>.....Well anyway, I think you're so good you could one day be a pro!...Not saying you aren't one now that is ;;