1 and 7 are my favorites for sure. On 1, my only recommendation would have been to change the composition a bit to cut out some of the emptiness on the right third of the frame. I like 7 because I'm a fan of abstract shots like that. You exemplify that you have the mind of a photographer to compose an image like that. You think outside the box. Maybe crop just a
little bit off the top and right side, then it completely rocks.
2 has potential, but the sky was blown out to pure white. Try a graduated filter next time to maintain the color. A nice blue sky would have been great with the vivid green grass.
3 and 4 are unfortunately spoiled by the horizontal fence boards and 3 would have been better if the horse was looking up at you.
In both #5's (yep, there's two

) and #6, the metering was a bit wonky, so you ended up with whites that were over-exposed and shadows that were too dark. Those could maybe be cleaned up in post-processing. For future shots like that, if you could have a friend hold a reflector just off-camera to reflect the sun and lighten the shadowy side of the horses, these would be fantastic. It'd also let you shoot with a lower exposure value to help keep the whites intact.
Overall, they're not too shabby and you're definitely on the right track! :thumbsup: