You nailed it! The terrain is uneven and realistic, which is how it should be. The models also look very good and match the terrain. There is nothing I can spot wrong.
Your work here looks really great! The terrain and building work is especially good. I’m very impressed with how you used my tutorial!
I would recommend looking into texturing work to bring out your build even more. You can look at websites such as textures.com to find good high quality seamless textures. If you need any advice on doing this, let me know.