I only saw the first video because I am on my phone an it's slow -__- I'll watch the others when I am on a computer!
But for the video I saw, the mare is pretty cute. Very green though. One thing I see major is that she jumps sideways. My horse used to do the same thing when I first started training him. Really work on having a strong lower leg so you can support yourself. You need to have the strong support so that you can sit up straight and control your horse and ride to your best ability. Having this support will also help with some of the problems that might have hurt you in the show. For example, getting the changes, spots, strides, and will also improve your equitation. Around your corners, it looks to me like your doing the "motor cycle" turns, leaning to the side. With a strong leg, that will be eliminated(:
Also, COUNT YOUR STRIDES! I still count outloud with my horses step, and with counting your strides will make you consistent with your spots. Over a fence or two she was put in a bad spot an had to skip over the fence. Look up, count one, two, one, two, one JUMP. Go into your jumping position when she takes off so you don't get bumped up if he does take in that extra step to the fence.
You and her both look green but you have a bright future! Keep working towards being a champion and you'll achieve success(:
And bear with my bad spelling errors.. And sorry If some of it doesn't make sense. I was getting Taco Bell and typing at the same time(:
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