Not too bad. The heels down and thumbs up is a huge thing! While posting, you should try to sink your weight down those heels and post forward with your hips instead of up. Think small. Try taking your feet out of the stirrups and post like that. You will see how small your post is and how much you go forward, instead of up. This will help a lot.
Also try to think about holding two ice cream cones. You want them off the neck, but close together. You don't want them to go in, because they will smash together. If they go out, the ice cream will fall off. That's how I learned!
You also tend to slouch a little bit, so sit tall!
For jumping, I'm not too good with critique either, but I'll give you a few pointers. First, you want to put your hands up a little higher up the neck and off the neck. With the small x rails, you don't need to come out of your seat quite as much. Once you get higher, you will need to more come forward, instead of up.
this is a pretty good example, you want to lie closer to neck, like above.