This is not a dig on you, OP, more of a statement of my expectations as a consumer that may or may not help you to stand your studs more efficiently.
If I had a mare I was looking to breed, I would not take more than a cursory glance at any stud that:
a) Was not already 5-panel tested
b) Was not turned out appropriately for their advertised discipline (cleaned up, brushed, and looking sharp). I don't require pulled manes, clipped ears, and tons of show-sheen unless they are show horses in show shape, but at least pull them out of the pasture, make sure there are no knots in the mane/tail, and knock the dust off of them. Also, put them in a decent looking halter. Doesn't need to be a leather show halter with 8 pounds of silver, but it's not hard to find a nylon/rope halter that is clean, unfrayed, and properly fitted.
c) Has not had their feet done in (obviously) quite some time. That suggests that the owner doesn't really care about the well-being of the animal...and that concerns me. If they can't be bothered to do something so mundane as get their feet done...what about cleaning them before breeding? Will my mare catch something from a dirty stud?
d) Does not have good conformation pictures that show the entire horse as he's squared up on flat ground. If I can't see the entire horse, then that suggests to me that the stud owner just can't be bothered to take an extra 5 minutes to catch them out of the pasture and make them stand square...or there is a conformational fault that they are "avoiding" by taking pictures at a funky angle. Also, I don't like grass footing because you can't see the horse's feet. Preferably hard pack dirt, gravel driveway, or asphalt/concrete is what they should be standing on.
e) Does not state in the ad what the stud's accomplishments/training consist of. If the horse has never been broke...why? Was he injured? Did nobody take the time to break him because he was only a "baby-maker"? If he is broke, what discipline does he excel at? It's great if he's got foals on the ground that are accomplished, but I want to look at studs that can do something themselves too.