Beautiful color and design here. Your brush strokes are very nice and controlled.
If I could add any suggestions, it would be two things. First, the mane, tail, and head appear to be painted slightly sharper than the body, which makes them feel pasted on a little bit. I'd just add some sharper shadow strokes from the head and mane detail being cast on the body to unify them. The next thing deals with anatomy. That back hip to leg anatomy seems off a bit. It could be that the leg is coming forward and it's just hard to show that well. I would move his right back leg back which would do two things. It would give you a more dynamic pose (you typically don't want both legs doing the same thing) and it would make that anatomy much easier to draw.
The way you painted the head is GORGEOUS! I wouldn't mind seeing that as an image by itself in your portfolio.