Really cool art, although I have to criticize the design of the character.
I have normally no problem with the amount of skin visible on characters, but in the case those legs should really be covered up completely, or at the very least on the inside of the legs.
Riding horses for extended periods of time would already start to chaff on the legs even with full riding gear, but this warrior rides a dragon... with scales... and horns... and she has nothing protecting her thighs. See what I'm getting at?
Giving her the adequate protection and/or padding on her legs would add some more realism/believability to the character design, despite the unrealistic setting.