your drawing lead me to reading your comments so your character design is interesting enough to attract people to him
I'm enjoying your comic so far your characters are really likable, and the pages are easy to follow.

On to your picture: I think it overall is very appealing and beautiful. The subtlety of the background really makes the character the focus. I'm assuming this is meant sort of like a model sheet in how its presented but if its not, I'd be craving some sort of foreground element to tie the image together.

as for the character himself, I really love his overall look. the style of him (an your whole comic) is simplified but still loaded with details with a great colour scheme. I like the shape of his face and the improvements you mentioned are great.
the horse part of the anatomy has a few issues I noticed. The legs are quite short, and his rump is a bit too round. a horses butt is a little more pointed. ([link] this photo is a good example of what I mean). That photo is also a good example of where a horses tail comes out. your characters tail seems to almost start on the top where it starts right off with hair, but there is a small part that extends off the spine that is still the regular coat, then the tail hair comes in and hangs off after that little space.
Those are picky little things of course, but the little things are important sometimes

Anyways, overall like I said, its a great piece. I'm really enjoying your comic! I'm especially drawn to the characters eyes, which are all wonderfully expressive!