Your posture in the western photo looks fine, but in the english it could use some work.
To start, I would like to see your hands further up on the reins so they are more out in front of you. Right now, your hand is almost touching the knee-roll on the saddle, when it should be up a few inches on the reins.
Also, I can see that your too-small saddle is causing your seat and leg to go a little wonky. Your foot has twisted awkwardly and is in a weird spot, and it is too small of a saddle for your leg length.
I can't complain too much about your upper body though, although I think you would look much better overall with these quick fixes ^^ :)
I like how you're looking up ahead and seem to have a tall, more upright posture (rather than the exaggerated leaning forward often seen in the hunter ring). Keep up the great work, and get a bigger saddle!