>>7694144
You know that pic of a scholarly vegeta leaning back against a bookcase in a library, looking up from his book and giving you the stink eye with slightly pursed lips? Your horse is activating very similar neurons and hey, I dig it. Though his mouth seems a bit receded into his face rather than being a slight convex jutting from the cylinder of the mouth. Even if the skull is not human, the frontal portion of a horse's skull also contains a cylinder, although much narrower than one found in a human's skull.
Also I kinda get you with having issues seeing and judging the primordial 3D shapes in anatomy, but honestly it is a really good skill to train because it will improve your ability to break down complex shapes into more manageable chunks. Try to look at real photos and draw the cylinders, spheres and boxes of the human body over it. Almost like tracing, but in this case what you're searching for is simply information of how these basic shapes are distributed on the body and how you perceive them.