I agree with the poster who suggested you lower your stirrup just a little; I think that would enable you to get your leg underneath yourself a little more which would put you in a more ideal position. Your posture looks lovely! I'd like to see you with just a little more bend to your elbow, and possibly bring your elbows a little closer to your body, although what I'm seeing could be a trick of the light, I can't make up my mind!
Regarding your cute horse, I'd like to see him reaching into contact more, rather than bracing against the bit and hollowing his back. I'd bet he's a forward ride and you're used to trying to slow him down. Although it seems backwards, hot horses really need more leg, to get them to learn that they must accept leg. It looks like you have quite a bit of air between your lower leg and the horse, probably because he's hot and sensitive and he doesn't take much leg to send forward. However, holding your leg off his side is limiting his ride-ability and your level of control. Ideally, he would accept your leg more willingly and allow you to ride him from your leg into your hand. If you can get him working properly like that, he will begin to allow you to ride him into contact, rather than bracing against the bit. And as another bonus, a horse that is working properly through his back will build up a nice topline, which just makes them prettier. :)