How can I fix this?

Okay, so I submitted the following sprite sheet and it got rejected, but I was told that it was really good, and that I should fix the hair and resubmit it and it might get submitted. Given there are very few pixels to work with I'm not too sure how I can fix his hair. Any advice?

  Zelda2LinkBotW.png (Size: 3.55 KB / Downloads: 3)