Join Date: Sep 2012
Location: Central Western NSW, Australia
The big thing that jumps out to me is your ear-shoulder-hip-heel line. Hip-heel is perfect, ear-shoulder is perfect. You just need to align the two; it looks like you're leaning forward quite a bit. The whole 'balloon pulling you up' idea that Fulford said is brilliant.
And again like Fulford said, your hands. They need to hover over the neck rather than around it, and your hands need to be upright. A way I used to get myself into the habit was to give a thumbs up and then put your thumb down over the top.
You're doing pretty well otherwise, and I envy your leg position. I'd spend a bit of time working on your posture, because seeing those pictures I was imagining the horse dropping its head and pulling you straight off over the front. If it helps, get someone to hold a broom handle or something similar next to you whilst your sitting on the horse, and have them line you up to give you a feel for it.