Haha, kinda funny, the summer picture is actually from early last summer and the winter pics are from this year. She probably looks younger in the winter pics because she was so crazy in the arena, always a step away from spooking, or bolting, or both. Plus she wasn't worked as hard as she is in the summer, of course.
And yes, her back is quite short, haha. Then again, she IS an Arab, I guess. XP
I don't have any good, squared up, recent pics of her, unfortunately, but this is what she looks like now:
I use her as a trail riding horse first and foremost, and don't work her all that hard (especially because it's been so hot lately!), so she might not be very muscle-y right now, lol.