Cool project! There are some issues with your scale and rocks. I also believe you should be using modular rocks instead of making all of it in one mesh. (example in below) Here are some critiques that hopefully can push your project's quality better. 1) The blue "ring" in the concept art has a wider radius and thinner…
It is really up to you if you want to start over on your rocks and terrain if you prefer the more defined rocks. But I highly suggest you fix some models including the ring and main props to fit with the concept art of scale and proportion. Modular rocks probably will help you a lot. Can you show your model with a checker…