this is the best photo, best position:
int that photo your lower arm maintains a pretty close to straight line to the bit. in many others, you have your hands pointed downward, and an odd bend to your wrist, almost as if you are holding a tea cup delicately at a tea party, pinkys out! very lady like, but not correct or effective.
if you have to work so hard that you are squeezing with your legs a lot, and it makes them come up behind you , which make you off balance, then it's long past time to take a crop and "remind" your horse of his job. if he needs time to warm up, do it mostly at the walk, and then at trot, for a bit, have a very loose rein and get him to stretch forward and move as loosely as possible before taking up any contact. But once he has been given a fair chance to warm up, and you ask for him to trot out, and he is asleep at the wheel, bop him one!
you also have too much roll forward in the small of your back. it means you end up riding too much on your "peepee", for lack of a better word. bring your pubic bone upward a bit (tucking your tail bone under a little but do not collapse at the waist), and when you post, and you go up and forward, think of your whole pelvis going forward. to counteract your tendency to bring your waist forward first, think of advancing more your pubic bone.
I didn't really even notice looking down as an issue. horse is cute, and you look very cute on him.