Well if you are on a pvp server the huge mount will make it easier to target your leader, but not by much since she will be in front anyway. It could sort of put a big target on you.

I wish horde had something small like gnomes. That way I would make my leader a gnome just so he would be harder to click.

Just going by looks I would say keep it like you have it. When everybody is exactly the same it seems a little generic looking to me.