Your hand position in the first pic is way all over the place...I'm guessing you probably caught that already. You want to keep your hands just in front of the wither, but not on top of it, if that makes sense? You don't want the hands right next together, is what I'm saying, but you dont' want them way far out like in that pic either. It looks like in the following pics, you wound up placing your hands too close together. It's a delicate balance.
I do like that you keep a pretty straight line from rein to elbow; I would like your lower arm to come up just slightly though, to create a bit more angle and thus a bit more 'control' in your arm.
Try to focus on bringing your heel down, and keeping your leg under you.
"The ideal horseman has the courage of a lion, the patience of a saint, and the hands of a woman..."