You know structurally that little guy doesn't look too bad. His butt looks odd because of his markings but the structure is fine. Spots and splashes do strange things to the apparent conformation of a horse. I don't like his front pasterns, or his hind legs as a whole, but he's cute.
One thing to remember is that I don't think I've ever seen an ugly pony. They are all cute! A friend boards her little 13.2hh half-Arab gelding here and he is the oddest put-together horse I swear I have EVER seen, yet he is still adorable. A full size horse with his proportions and conformation would be quite unattractive but on a pony, awkward can look good. That being said I haven't actually had a lot to do with ponies for quite a while now... much as I think they're adorable and love working with them, I buy for ME, and I like my horses big [16hh+]... Monty's only 15.1 and I feel really tall on him even though I'm actually not. Anything under about 15.3 has to be really quite chunky for me to be comfortable, and have big movement.
I do really want to do another "pony project" but no longer have small enough saddles & with no room or money for a third horse, even a pony, it's going to have to wait. I guess my "pony project" can be helping my mother break in her nearly-2yo pony filly, very lightly, over the course of a few months... once miss Satin turns 2 properly that is.
True, ponies pull off ugly better then horses, if that makes much sense. But it isn't true all the time, like Thumballina, the smallest horse.
I normally like taller horses too, my recently retired horse is 16.2hh, but lately I've had terrible luck finding anything decent that's taller then 15.3hh. Right now I have 4 horses [don't freak out just yet!] one is a QH gelding free lease, one is a 2yo I just got for future barrel racing, a mare that has mental problems [the vet thinks either seizures or her oxygen was caught off during birth and caused her brain damage], and then last but not least my old retired guy. The last two stay at my moms house for most of the time and are trail horses.