This is my 14 year old AQHA mare, she is 15.2 hands tall.
She is trained in Reining but also does well in western pleasure and halter.
I'm sorry I don't have any photos of her standing square at halter. I hope these photos will work okay.
This is her pedigree- Reeds Chip Quarter Horse
She is standing a little weird in the photo below because I was trying to get her to square up.