Only that that's a really dangerous home made jump :( If the horse knocks the rail there is now here for it to fall gracefully because it's stuck between the arms of those chairs.
You have a big, beautiful place to ride and I am jealous
I've never really understood why people say this. If this jump was "too dangerous" then all XC jumps would be "too dangerous" and judging by the area of the jump, I'm guessing that's what this is.
Anyway, what I saw was like you said, you pull on the horses mouth, you have chicken elbows, and your heels need to go down further. Now. Two of these thing are easily fixed. One, is a bad habit that you'll have to work on.
1) your feet are too far in your stirrups. This makes it more difficult to put your heels down correctly. And- while we're the topic of stirrups- you leathers need to be shortened about two holes. They should rest just above your ankle bone for jumping.
2) Pulling on your horses mouth. Does your horse rush when jumping? My guess is yes; that is the most common cause for pulling on the reins. That, or you got left behind, which you didn't. If you horse rushes, take him to the jump like you're going to jump it, but leg yield to the side, and sometimes make a circle and approach again. Do not jump when the horse is going too fast. This reinforces rushing. If you watch top notch riders, they aren't always in jumping posistion between jumps. They use their seat to slow and balance the horse before the jump. Make sure your horse is relaxed before approaching the jump- a tense horse isn't going to listen well. And as he listens better, you'll feel it less necessary to pull on the reins before the jump.
3) chicken wings, you'll simply have to stay conscience of when jumping, and try to correct it.
I really like your soulder, hip, knee line. You aren't far ahead of the horse, which is common for novice riders (I, myself, am working on correcting this problem).
Other than that, I don't see much. You're looking ahead nicely. Nothing stands out too much. If you'd put a photo of you jumping a decent height, some things may pop up that you don't see over 20" fences.
Remember, have fun!