IMO neither of those mares should be bred from what those images showed. Both are weak in the loin area.
The paint is tied in below the knee and has what looks to be weak/posty hind legs. Nice neck and her head ties on nice to her neck.. and her head is nice.. but you don't ride the head.
The black horse looks butt high and also long in the back. Maybe she has better front legs, but from this photo you cannot tell.
I would like to see photos of the stud.. and if he is as lackluster as these two mares, I would not breed him either. OTOH if your stud is spectacular, you want better mares than these for him.