Not sure the pixelated cutie mark really works, even though I get that's the theme here. It might look better without a black outline? Or maybe it's the placement? It's just throwing off the look of the pic for me. It just looks flat, while her rump is angled.
But otherwise she's super cute! I love her hair Really nice colours and it surprisingly works well with the banana yellow body. The vector lines look smooth and even, which is always good.
I love pegasi My OC is one as well and I'm sure she's like to be friends with Pixel Gum.