Firstly well done that your getting into jumping, it can be great fun.
Do you have an instructor? If not it might be best if you want to get in to jumping to book yourself a lesson maybe a few times a month.
Yey, I think you need to take your striups up about 2 or3 holes, lift yours hands, they seem to be sitting around the front of the saddle, let them follow the horses neck, you don't want to jab your horse in the mouth by not allowing with your hands.. and theres no need to be so high out of the saddle either, its just a small jump, For a jump this size you could get away with lifting yourself 4/5 inches of the seat, and have more of a bend at the hip...one other thing, youv quite alot of foot in the striup with your heels up, this can really affect your balance, keep your lower leg slightly behind when jumping with your heels right down
Post some more pics, let us see how your coming along!