Hi Horseluver! Remember me?
I agree most with Amlalriee (spell?)., I felt her critique was the best, though you kinda get the gist of the overall things people are seeing. I just wanted to add that I see HUGE improvement. !! you look really calm and easy for your horse to carry. The canter was very nice. Now, can you do that and raise one hand in the air, then the other and still have a good seat? Can you sing a song while doing that? Just to put a bit of relaxation in there, 'cause you looked so serious in that vid.
As for the trot, what I see, from a dressage background, is that becasue your leg is out in front of you, you are posting off of your knee, kind of like it's a hinge. this means that you have to actually bounce off the back of the hrose, and since she wasn't offering you a lot to bounce off of, (lack of impulsion), you look like yoiu could almost be the tinitest bit behind her motion, thus working too hard.
If you posted with your legs more under you, you would utilize all your joints in a very slight accordion style bending and opening to raise yourself and could then touche down very lightly in the saddle. You will feel more energy going down the back of your legs and more in your buttock. You are pulling your self up with your quadraceps . IF your horse started to go more forward suddenly, you would be left behind .
When you start asking for more impulsion from her and taking enough contact to kind of "string" her,, like stringing a bow, you will have that final element.
I think you really ride quite well and your horse is obviously comfortable and trusting with her rider, and that , above all, is important!