Some new sprites I'm working on...

Hi, working on a Test Mobile Game (using Game Maker and another online program), so I decided to make some simple test sprites using the Pixation app on iOS. This is my first time attempting to make sprites, so I based them off two classic 8-bit NES titles:

Ninja 1 (Legend of Zelda):

http://i.imgur.com/A5ZqsUd.gif

Ninja 2 (Mega Man):

http://i.imgur.com/9FVrXHj.gif

Any feedback will be appriecated, !