Okay so my feedback might be biased, but I think the problem here is the horizon line. I know what you were trying to go for, creating a great sense of depth with the foreground taking most of the space of this vertical drawing, but it's a little overkill. I'm basing my feedback on this video, it might help you.
https://www.youtube.com/watch?v=upxBGNcryRs&t=699s&ab_channel=BaMAnimation
Other than that I don't have much feedback, the others here have given really great feedback.