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<sub>This is super lovely! That lighting is awesome, and I really like the concept. I'm surprised this isn't more popular!
I only have a couple critiques, and they're more of a personal taste. The eye is a little too shiny and big, it doesn't look quite right. The mane and tail look really good, except I think you could add a couple more highlights, lowlights and shine on them. [:

Overall, fantastic job. <3

I have a question about the image itself, though... It looks a bit pixelated. Even when I click download, the image isn't super smooth... Any reason why? o.o</sub>