She is a Female Raven. Fat, with blue eyes and green skin (inside her mouth and scar/girly bits).

She has a green scar on her neck that makes it always smile. The feathers around her scar are missing.

She has corvid type legs. Her wing arms have only her first two fingers and a thumb. Her feathers on her wings are always torn or tattered looking, She however can still fly.

She has a white spot on her bum just above her tailfethers.

THE IRL SCAR MY SCAR IS BASED OFF OF! IF YOU LEAVE ANYTHING OUT PLEASE DON'T MAKE IT MY SCAR. IT IS LITERALLY A PART OF ME.

http://www.furaffinity.net/view/10303282/

If drawn in clothes she's probably wearing a brightly colored sundress of some sort. She hates shoes but if she has to wear footgear it's going to be sandals, even if it's cold outside.
I look like that stereotype Colorado hippie... probably because I am one. If not in a sundress, novelty tshirts and a skirt... if she -has- to wear pants it would be black slacks or cargo pants.
Or any other outfit that fits the scene.

More art of Mazz for reference:

http://www.furaffinity.net/view/9777635/ White butt spot

http://www.furaffinity.net/view/9631469/ Shows how she is missing feathers around her scar.

http://www.furaffinity.net/view/10147127/ Perfect example of her wing arms/hands.