I agree with RD, you can spend weeks with adding detail to your terrain, adding insanely many little bumps and waste your polies, but it won't necessarily look good.
You took quite some effort and your map doesn't look bad, but your rocks look a little odd and the river ending in the sky doesn't really help. I know you're still starting out with mapping so this is is a pretty good result for the beginning, just try using bigger and less triangles next time