Be careful using a mare to get a stallion to "show" for a picture. We tried this once.
First, let me say we are NOT professionals by any stretch of the imagination, more like 3 hillbilly's with a picture box. Second, the stallion we were taking pictures of had never been shown so he had never been taught to stand up etc... There were 3 of us doing this, Dad taking pictures, I handled the stallion and Mom had the mare. Apparently the mare we were using was in heat and every time she came near the stallion which I had set perfectly for the picture, all we needed was neck arched, ears forward you know... the look, he moved before Dad shot the picture. After several times of this happening, Dad got frustrated and told Mom and I that we were doing it all wrong so I told him if he wanted to hold the stallion I would be happy to take the pictures. Of course he was going to show us both how to do things "right" and he got the stallion stood up, told Mom to bring the mare closer and of course the stallion moved. So Dad gave a big yank on the show halter and the lead broke and the stallion took off for the mare. As I said she was apparently in heat and the stallion took off and jumped the mare. Mom tried to lead the mare away but the stallion stayed up there and followed. So, we now have Dad standing in the yard holding an empty lead and muttering under his breath something about dang women (I'm not sure if he meant Mom and me or the mare), I'm chasing after the stallion who is after the mare and Mom is doing circles in the yard with the mare who now has a stallion attached to her.
Kelly
I finally got the stallion dismounted and settled a little bit, I fixed the lead, we put the mare away and finished the picture taking session. Didn't hear alot out of Dad the rest of the day.
Now this was way back in the dark ages before digital cameras and I think we took 8-10 rolls of film (24 exposures each) of 2 horses that day and we did get a couple really good ones of each. You can see a picture of at least one of the horses (the one in this story) Circle S Cadillac Jack on Fikes Miniature Horses website from North Dakota.
If you are going to try to take pictures yourself, have plenty of help. Either have people who are true friends and will forgive anything or people you didn't much care for anyway as you will probably be fighting with them before it is done.