definitely getting better.
I think there should be hair/mane in front of her horn. The hair looks like it is facing me, not facing the direction she is looking and it makes it look odd. Lastly, and I'm not really sure, but I think the top-right bit of the hair is too far out.
I think a better way to explain it, would be that the mane looks like it is being used for a front-headshot, while the head is looking in a side-headshot position.
Also, I love Paint Tool SAI. It's a great digital art program.