Have to agree with Corazon. It's not the bend, so much as that you are ahead of the horse. Your weight should be in your heels, and your legs should be bent and perpendicular to the ground. That way, even if you fold, you fold over the center of gravity (just behind the whithers).
And as Corazon said, the horse's jump should put you in the correct position; you shouldn't be flinging yourself on the neck. If the horse jumps from a long spot and stretches out or jumps very very high, you should be folded over the center of gravity with your arms over the neck. The hands (but not your body) should be on the neck to allow it to stretch. (Either that or let go of the reins for the long spot.) The neck is the horse's balancing mechanism.
Now please take what I said with a large grain of salt, I am not that experienced; I am simply telling you what I have been told and what I see in your photos.
(And yes, Minstrel is right: jumping with your eyes closed does help: it forces your body to follow, and not anticipate, the jump. But I've only been willing to do that with an instructor. Horses are not that well behaved.)
Last edited by onuilmar; 02-13-2013 at 10:31 AM.