first off you guys look really good so I'm going to be really picky because your foundation is solid. first thing is that your toes are pointing out which leads to an improper distribution of your weight and the connection with your horse. you want your toes pointing forwards and the inside of you leg touching the horse's side. this will allow you to keep a connection with your thighs and slightly with your knee which is important. also i'd like to see your elbows by your sides and your hands a bit more independant. I think your shoulder could come back a tad and your back is a bit too arched.
right before the oxer you seemed to be putting more weight in your left hip which caused your horse to switch to the right lead on landing. you did ride a nice lead change afterwards but in the hunter and eq rings you want to avoid needed to do a flying change and you want to get your leads over the fence. in the pictures it appears as if you might be ducking a tad but its hard to tell.
my main thing that i can find wrong is that your horse needs to be put together. she looks strung out and a bit unbalanced. I would like to see more impulsion and have her stepping from behind up through her back and really finding the bit. i'd also like to see more bend through your corners because she's leaning. when you rode to the one vertical after the oxer you rode too much off your inside rein and then you had to get her back onto your outside rein once you completed the turn, ideally your horse should be riding into your outside rein at all times. i think working on bending would help and making sure she doesn't lean through her turns to the jumps will be a huge help once the jumps get bigger.
over fences i really like your eq, you might be jumping ahead a tad but its not to the point where it will majorly affect your horse. it could use some tweaking but so could everyone's position. overall you're a great rider and these are just some minor things that you could improve on. good job!
Roo and Hazel = my life