Since you like so many, I'd start by ruling some out. The 1st Morgan has a right front hoof that is quite a bit taller than the right one. Since club hooves can be genetic, I'd avoid that one unless you could see photos of his progeny and they had nicely balanced hooves.
The 4th horse, black Connemara has an even more pronounced club-type hoof on the front right. It appears to have some kind of creative shoeing applied. That's something you manage if a horse happens to end up with it, but I would avoid breeding a horse with a pronounced hoof issue like that unless there was a way to prove it could not be passed on.
The 3rd horse, cremello Connemara has a rather straight hind end, and I would avoid that too in case the mare made it worse - it could lead to soundness issues. I'd also avoid the Friesian cross. They have many genetic problems and especially since it is a cross, the unknowns that could show up might be very bad. They can even carry a dwarfism gene.
I take it you like certain colors, but I'd look at hooves and conformation first since you can't ride the color (unless you want a pretty pasture pet).