Composition is more of a trial an error, so try some different croppings, flip some elements, and see what you like. Also helps if you have a more solid idea of the story you're trying to depict. The more elements you introduce to your story, the more things you'll have to pull from in your painting. Here is a try. I felt most the contrast in the image was on the left side, so I put our subject on the left side so our eye would be more drawn to him. Also the landscape is guiding our eye that way as well. And the sideview of the horseman wasn't really working for me, so I stole a back view from somewhere. The sky looks pretty grey, which tells me you're filming with a yellow filter. So I decided to emphasize that a bit more, shifted the red hues in the background slightly to orange, and desaturated them a bit. Since the yellow filter kills the blue, the blue pants on the rider were bothering me, so I went with grey. I went with a more intimate cropping that contained the landscape features a bit more, but depending on story, you could choose between a more open feel vs a more claustrophobic one. There is no single right answer, though there are choices that support your story, and choices that don't, so be conscious of the choices you're making and for every choice, ask yourself if it's helping or hurting the story, and you'll have to be somewhat critical and inquisitive to find the better choices. Edit: And after I posted, I realized I created a tangent with the hat and the landscape... don't do that.

The farthest mountain is much more saturated, which makes the piece unrealistic. It should lose saturation as you move farther away, and at that distance, it should be more blue due to atmospheric perspective. I think the composition is fine, but the sky is wasted space. I would find some interesting looking clouds that subtly point to the direction he’s looking at. I also feel like the horse should face a little more forward, not at perfect profile to the viewer. He’s just facing the dead end rock right now. 😆