Those are beautiful photos and only for that reason am I going to be hyper-critical: I thing they're so good, they are worth improving.
Landscapes & scenes: no matter how gorgeous is is, it will be a lot more interesting if there is a point of interest, a unique feature, one that draws the viewers eye.
Close-ups. Make sure you are absolutely sure that before you take the picture you have decided what is to be the focus point, and then make certain that the camera focuses on that bit. The picture of the hand on the horn (pommel? Weston saddle thingy) is a case in point.
Horses. Unless it is your intention to take a grumpy horse picture, seek to always get those ears forward. Do whatever you have to, dance up and down, have a friend throw gravel in the air. A well composed horse picture needs ears in the right place.
They are extremely good photos, keep enjoying.