Butt high for sure, even though in the side-on photo he's not on level ground. Also a bit upright in the pasterns. Butt high makes it hard for them to work correctly and increases the strain on the forelegs as it pushes the centre of gravity farther forwards and therefore puts more of the horse's weight on the forelegs. Upright in the pasterns gives them less shock absorption making for a choppier ride and potential soundness problems in the future. He also looks like he doesn't have enough depth through the loingirth (where the belly meets the hindquarter) and that will make for a structural weakness of the back, meaning he won't be a horse that will carry a lot of weight. He's a little long in the back which further decreases the amount of weight he can carry but he should be ok for the average rider... as long as you keep in mind to try to be gentle on his back. As a beginner you won't BE gentle, because you won't have your balance or the muscle strength, but as long as you're trying, that's the main thing.
If you're new to horses your main priority is that the horse is sane and sound and is a comfortable ride, though, so as long as he is a safe mount for you, it doesn't matter if he won't reach the top in whatever discipline. The best advice I can give is not to worry about the breed and look for a horse that is safe for you. The hottest horse I know is a QH and the quietest an Anglo Arab! Of course, breed stereotypes are there for a reason, but don't get too hung up on breed. My first horse was a Standardbred bought because the stereotype is that they're forgiving and level-headed... he was my worst nightmare... nervous horse that bolted often and had barely any stop. How I managed not to get hurt, I don't know. It just didn't work out very well for all involved.
To me, the horse you're looking at looks part QH. A full QH would have a lot more muscle and (local to me) a lot more thickness of bone through the legs. He may be an appendix (Thoroughbred cross) which are nice horses but some inherit the TB scattyness - again, a stereotype, my family had a TB that was an amazing beginner's horse, totally reliable. (until you took her out to riding club but that's because she raced and then sat as a broodmare until we got her)