Thanks for all your help!
wdblevin- Yeah, Gainesville as in Florida! Where are you from?
As far as ground mounting, most heights aren't a problem for me. I had a coach for three years who didn't believe in mounting blocks, lol. I rode bareback all one summer, and had to ground mount a 16hh QH. I feel comfortable on pretty much anything as long as it's not way too small.
smrobs- thanks for the picture, it really helps! The horse your brother is riding in the picture is 14.2?
Saskia- thanks for the tip! I'll definitely try having someone take a picture of me riding her and see.
All in all, I feel pretty comfortable on this mare, but I've been told that I look awkward on smaller horses. The horse I currently ride is a gelding around the same height, but a little stockier. I feel totally fine on him though, and we get along really well on the ground and in the saddle... We've even been in the ribbons both times I've competed on him.