It looks like you're trying to link to photos in your Yahoo mailbox. If so, the reason it works for you when you click on it is because you're logged in to your mail account. Since we're not logged in as you, it denies access to the photos and puts up an error message. You need to either download them to your computer and attach them directly to a post (hit the 'Go Advanced' button, then on the little paper clip icon) or upload them to a photo sharing site and then share a link from there.
You have a nice straight back over the fences and are looking up - good(: Good release, too. Your body looks a little twisted in the saddle - maybe it's a distortion. But try to keep yourself as straight and centered as possible for better balance. In the approaching pictures, your leg is too far forward. Work on keeping your heels down and your center of gravity balanced right in the middle of the saddle. Keep in mind that there should be a straight line through your head, shoulders, hips, and heels. A way to keep a steady leg is to remind yourself to keep your knee area always in contact with the horse. Don't pinch with your knee, but keep a level contact. You may want to shorten your stirrups a wee bit. For the jump, it looks like you're out and ahead of the saddle a bit much. Let the horse throw you up, don't try to lean forward, as you don't want to be up over the pommel. This will also help you to keep your leg steady and not have it move back as far when you go over the fence. Lots of trot work keeping contact with your knee and weight in your heels will help strengthen the leg. Looking good(:
Shortening up those stirrups should help you out quite a bit. It's hard to critique without a video, but from what I can see you look nice! :) Just make sure you are sinking those heels down. Remember: over the jump, you aren't standing in your stirrups. You are sinking into your heels, using your legs to raise off of your horse's back, and allowing the horse to jump up to you. Do you have any way of posting video?