#1: You;re leg is sliding back (you know this), pull your shoulders back, and bend your elbows.
#2: Woah! He has a great expression, his tuck seems good (however, I'm not a hunter rider so I can't say much about that). You have a pretty good position...try to stay off of his neck.
#3: I can't tell much (blurry!), so no critique.
#4: Well, it's old...you probaly know what you need to work on now!
#5: You need more of a release. Your leg is slidding back, but your in the dressage saddle. Also, you need to get out of the saddle more, however it is a dressage saddle, and I can totally understand how hard it is to get out of it when jumping (they suck your butt in)!
#6: You kind of have "chicken arms". Shorten your reins a bit. Your upper body looks pretty good.
#7: You're getting too ahead of him. But you're in the dressage saddle, right?
#8/9: You have a pretty good overall position, besides your leg is back. Also, more release.
#10: Try to get out of the tack a bit more. Your leg looks nice, he has a nice tuck, and looks really happy.
#11: Shorten your reins, you leg is slidding back. Your upper body looks fine, and if you weren't in the dressage saddle your leg would look great.
#12: It doesn't look that bad, it's kind of hard to tell for some reason.
#13: Try go get out of your tack and more of a release.
#14: You're getting too ahead of him. I can't tell though because of the lighting.
Okay, I'm stopping here.