Not bad for a beginner. You made a few rookie mistakes though.
Linework: Your lines need to be reworked to be more clean.
Shape: I'm not sure what you were going for but the arms look way too long and awkward.
Outlines: Your outlines take away from the sprite rather than add to it, especially at the bottom. When outlining, you made the cloth look like a solid object. It's hard to explain but when you have parts sticking out of something it looks like it's supporting itself. You should let it hang. The outline of the head seemed to confine the light into an area. Not sure that can be helped.
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Here I fixed all the mistakes I saw and added my own personal touch. I like my sprites shaded so I added dithering in case you wanted to keep a small color palette.
Good luck with your game.