The area from the knees down the pastern and fetlocks on the foreleg looks odd, the pastern is too far forward to the point where it looks spavined.

I'd say the body looks like that of a young horse (the depth from the withers to the girth is fairly shallow and stifle to loin is undeveloped).

The rear hocks come out too far unless you are making a quarter horse. The head is a bit large for the body and the legs are too short for the size of the head. The chest muscle looks good, the one over the shoulder is a bit high.

Sorry if that sounds horribly critical, it really is only a matter of adjusting proportions, but as a rider and horse fan it's hard not to notice where the anatomy of a horse doesn't look right.

I would suggest that Ice Queen hit the nail absolutely on the head; it might pay to find some pics of the sort of horse you want to create and then adjust the proportions and anatomy accordingly. If you are going for a steed of choas you might want to pick quick a hefty horse.

There's a few breeds to get you started;

https://www.bhs.org.uk/Breeds/Breed-index.htm

and a google search for horsee anatomy should turn up some nice drawings of the whole and different parts.