Okay, here's my little explaination. Sorry for pretty much completely re-drawing your picture, but I had to adjust the proportions. The head shoulr be longer, but the slope depends on the breed. Not many breeds have downwards-sloping heads like the original drawing, though. The muzzle should be roughly about 2/3 the size of the cheek. The eyes are small, a bit bigger than the nostrals. The neck is a bit thinner, but is thicker on stallions than mares.
The shoulders aren't too defined, except for the muscles on the side, not the front. They slope downwards into the legs. Above and below the kneee is about the same size, and the area above the knee does not get smaller, but stays about the same size, then gets bigger.
The back isn't too sloped in a horse, but is more so in a pony. You don't see the line where the spine is unless you're looking at the horse at an angle. The back legs are fairly sraight, except for two spots: right at the top joint, and at the knee. There it gets a bit rounder. The back legs are alos even above and below the knee. The hindquarters is pretty rounded, until it gets to the joint where the leg meets the stomach. The muscle can be seen as a slightly rounded area there.
The underside of the horse is not completely round, but starts a bit thinner, then gets thicker, then thinner again before the legs. The mane and tail have to be proportional; the mane can't be long while the tail is short (unless it's cut, of course). The mane is on one side or the other, not both. Sometimes, a portion of the mane can be on one side, while a portion of it is one the other, but it is never a direct split down the center of the mane.
I hoped that helped! I had to lighten your lines so it didn't get too confusing, and sorry if it's what you wnated.
The shoulders aren't too defined, except for the muscles on the side, not the front. They slope downwards into the legs. Above and below the kneee is about the same size, and the area above the knee does not get smaller, but stays about the same size, then gets bigger.
The back isn't too sloped in a horse, but is more so in a pony. You don't see the line where the spine is unless you're looking at the horse at an angle. The back legs are fairly sraight, except for two spots: right at the top joint, and at the knee. There it gets a bit rounder. The back legs are alos even above and below the knee. The hindquarters is pretty rounded, until it gets to the joint where the leg meets the stomach. The muscle can be seen as a slightly rounded area there.
The underside of the horse is not completely round, but starts a bit thinner, then gets thicker, then thinner again before the legs. The mane and tail have to be proportional; the mane can't be long while the tail is short (unless it's cut, of course). The mane is on one side or the other, not both. Sometimes, a portion of the mane can be on one side, while a portion of it is one the other, but it is never a direct split down the center of the mane.
I hoped that helped! I had to lighten your lines so it didn't get too confusing, and sorry if it's what you wnated.
thats why i asked for help! ^^
