Overall, I like him. In the second photo, his front right (that chestunut) hoof looks strange to me...I couldnt tell with the grass of the first photo though if it was just how he is standing. For some reason to me he looks downhill also.
Take my advice as you want though, there are people better at this than me on this board.
He does look very downhill to me, in both pictures. He seems to have a large backside with strong hindquarters and not much going on at the front. He seems to have quite an upright shoulder and a short, weak neck.
How old is he though, because if he's not very old he may well grow into that back end!
A little downhill with a very big butt. Typical QH traits. All in all, he looks like a really nice horse. I love how low his neck ties in with his body, natural low headset. Something does look odd about his right front foot but it may just be the angle of the pic. I would go for it if he is in your price range, I think you would be getting a really nice horse.
I dunno. Something about him kind of bothers me. He does seem to be rather downhill and as said before, his hoof looks kind of funny in the one picture. Also, for some reason, to me, his head and neck just don't really fit in with the rest of his body. Like, they seem to be a little too small. I personally wouldn't buy him, but I guess it really depends on your personal preferences and what you want to do with him.