I like the second and third in your first set - you can see the muscles working and the strength of the horse. I like the little spiral hi tail makes in the third one. He (? not good on horse anatomy) looks like he's about to attack the post in the first one
A quick Google search for 'curly horse' revealed that there is such a thing. Most images the coat was smooth and the mane etc curled, but some were curly overall, although not this much!
There's an illness similar to diabetes that also causes a thick, long, rough coat. Again, the horse I knew that had it wasn't this impressive!
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