Didn't say it was good but I tried.
Legs-
Horses have knees and elbows, if you look at the bone structure of horses you will see where they bend.
Hooves-
The hooves have more of a slant, not straight down. If you want it will show you how to do this.
Back and Bum-
Imagine the horse is like peanut, a dip in the middle but not to big.
Neck-
Starts from the back of the head and down to the back, where it joins there is a hard mass called the withers.
Head-
The head was good, just a little more sloped.
Eye-
The eye was good, just a little bigger and further down the head.
Mane-
The mane was okay, just remember that the mane if flat unless galloping or jumping ect.
Tail-
The tail was good just try to add a more hair like look to it.
Nose- Was almost perfect, just add a little bit of lip definition
Ears-
Where pretty good, just add a little more shape to them.