In all honesty, I really don't like any of them. With the exception of the show picture with the guy riding him.
Picture 1: There is just too much stuff around his feet and body. You really need a clean backdrop that isn't the same color as the horse. Because of the dirt in that picture, I have a hard time distinguishing what's horse and what's dirt from the middle of the cannon bone down on his back end.
Picture 2: Pictures from that angle are never flattering. It makes him look like he has no neck and a ginormous head.
Picture 3: Whole thing is really blurry, half his body is cut off, just a generally unflattering pose. If it was a clear pic, you could crop it and just have it as a bit of a close-up of his head to show his face, but it's not clear enough for that.
Picture 4: This is the only one that is stud ad worthy. It doesn't show much about the horse's build, but it does add credence to his show record.
Picture 5: It would have been an okay picture except it is really blurry and the tail bag makes it look a bit unprofessional.
Picture 6: Also a very unflattering angle for horse pictures. He looks tremendously sickle and cow hocked there.
Picture 7: Just not a stud ad worthy photo. To make a stud seem worthwhile, you really need the pictures to look as if they were taken by a professional, not snapped in the back yard with a kodak.
The lighting is all wrong in all those pictures, earlier morning or later evening light would be much better. Take them while the sun is still up and take them with the sun behind you. Make sure to have him standing square on flat ground that is a non-distracting color. Flat grass is always good, concrete sidewalk or driveway with grass behind would be better, that way we can see his feet and pasterns well. Pictures taken square from the sides and front/back will show what his conformation really looks like and will avoid making him look wonky.