I'm not great with conformation, but I do know it's a lot easier to evaluate with pictures where the horse is standing square and looking forward.
That being said, looks like both of their hind legs sit under them more than they're supposed to. If you drop a straight line down from the point of the butt it doesn't seem to hit the hock or really any part of the hind leg. Again, it could be the photos so it's hard to tell!
I'm not sure if that's much help, but in any case they're both adorable! Especially the mare. :) Love her face!