It seems in the top picture that you are a bit ahead of his motion, but then again, I am no expert in jumping. In the image of s/he and you trotting along, you are really leaning forward, but, everything is in line properly, but only technically. You should be sitting more straight up, with your back, from your tailbone to the vertebrae in your neck as perfectly vertical as you can get. Ear, shoulder, elbow, hip, and heel should be in a perfect vertical line, but your hip is far behind that line, and your elbows a little forward.
It also seems to me that you are sitting further back on your butt instead of on your seat bones. From the side, it should like like you're standing with your knees slightly bent.
On the positive, the line from your elbow to the horses mouth is practically perfect, but your hands are a little funny, as you have already noted. Your heels are nice and you are looking forward, not down, which is great.
Edit: Now that I've looked at it again, perhaps you are leaning forward because of your stirrups. They seem a little short.
Last edited by Salila; 06-10-2010 at 10:03 PM.
Reason: Wanted to add something.