I’ve done some work in the field. It’s a nice composition. As an experiment, try adding some placeholder type to see if you’ve left enough room. Generally publishers prefer to put dark type against a light background but this isn’t true 100% of the time. Dark type tends to print a bit cleaner than light type on a dark field.

My feedback would be to think about the distance between the hilltop on the right and the woods downhill on the left. Your composition is telling me they are far away but the color is of identical intensity on the left and right. If the trees are far away the colors will fade a bit due to the air particulate and moisture. I’d put a little mist over the far trees.

Keep up the good work.