He looks sickle hocked and his front pasterns are very upright.
I would ask to see a better picture of his front feet, they look odd as well.
He's angled away a little, so is probably downhill built as well.
Not sure if these faults are bad for WP and what not, but they could cause the horse to have some soundness issues. Especially with those front pasterns, I would be concerned.
Pretty bay color yes, but don't judge a horse for the color! I think you would benefit from looking at more horses before settling on this one.
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