I've noticed a recurring trend in your illustrations, particularly backgrounds - They tend to be clustered with busy, vibrant colours and filled with large contrasts. In this landscape painting there are large areas of pure white and pure black, some of which are right next to eachother, creating a very stark contrast.
Generally when making compositions you'll want to be able to lead the eye of the viewer in such a way that they're seeing your world as you envisioned it. I suggest that you look for ways to practice composition, and how to apply it in your own works. Specifically, Conceptart has a free workshop sample with an introduction to the subject, and FZD school has nearly a hundred free videos with in-depth explanations and examples
The first change I made was to establish a hierarchy of values (the brightness of things). This was in order to create a better sense of space and separate the objects from eachother. While doing this I added the house on the right side to create a point to fixate on. I made slight changes to the trees, and fence in order to make their rythm flow towards that house.
After that I recoloured the painting with a palette made from some colours extracted from the original. I used less colours that blends more to eachother to create unity in the colours.
I hope you don't mind the repaint!