Hehe, i voted this and other two. Good work :)

:-/ it's basically vector art to me :( I wish I understood this type of pixel art

 The idea and almost everything is very cool here, but I think that the white outline and highlight on the helmet are a bit jaggy.

haha. this is so true ;) 

Nearly perfect!

 Smooth, really smooth. Your AA rocks. 

@Motrox. No! Any reference.

very well done

 Coolio

nice :) Did you use a ref for the dolphin? I'm just curious.

Gorgeous.

 All your work is very smooth, I like it :)