For no instructor I would say you are doing good! :) Some things I personally see is you are all over the saddle, due to a unsteady leg. Work stirrupless as much as humanly possible, it will help tons. Also raise your stirrups a hole or so. Heels down and make sure
you arent gripping with your knees, as that will destroy your base support completely and allow your leg to swing all over. Another thing, sometimes you get into a slight chair seat, to help with that, again, make sure you arent gripping using your knees. Straight line from hip to heel.
You lock your hands on his withers, and they tend to get too close together. Thumbs always up. Raise your hands just slightly, and widen them just slightly. Keep your elbows in, and at your side. Move with your horses mouth. There should be a straight line from bit to elbow, and that line gets broken ocasionally when you don't move with his head, like such
You have to move your hands up when his head goes up, and down when his head goes down, keeping the straight line consistent.
As for the jumping, you want to fold, instead of lean. And you don't want to brace yourself on his neck. Keeping your elbows in, hands slightly higher and wider and moving more with his mouth with help you not brace with your hands on the jump. Bend with your hips. Heels down, don't grip with your knee, and bend at the hip while barely moving your hands up his crest as he jumps.
These are just some things I see... But looking good :)