well, that wasnt a crit per se...it was more of something to keep in mind, I meant that when you edit the sprite the focus should be on where the weight should be or how the impulses should flow trough the horse.
I guess I was just trying to say that you shouldnt focus so much on what should be where by which frame, rather on what's being pulled down, what's being pulled up...what forces are working on the Horse's body. thinking of what should be where is more of sequential image, comic thinking, but if you think of forces that is more adequate to animation.
I think it is completly usable the way it is now, what you do with it now just depends on what you want to emphasize on this horse's run.
here, I made a GIF of the gallop with correct axis
compared to yours, I think you still need to show more force on the pre-suspension/suspension part of the gallop, try to make the head counter the height shifts of the shoulders (whatever they're called), if the shoulders are down, put the head up and vice versa, same for the butt.
....all that's really left in the anim is fixing balance details like those, analyze the gif on your own and compare it to yours, maybe you can even try to chop frames until you have an 8 frame muybridge gallop so you can compare it with your own.