Love the image, huge fan of zebras, a little suggestion though, not nit picking, hopefully you're one who takes constructive criticism well. i'd soften the edges of the black around the eyes, right now they seem to crisp compared to the rest of the image. As well as smudge the edges of the mane a bit near the ears so it blends better like the end of the mane does.
But none the less fantastic mouse art, I myself would never be able to do something like this with just a mouse, if I even tried I'd be scrambling for my tablet in two minutes flat.











