Need some Art Critique

Hello, Mabye some people remember me. I havnt posted in over 2 years lol. Well I just need some art critique on a concept sketch before going in and polishing it up. I am going to delete the astronaut type guy in the corner and add a wizard icasting the metors on this peacful city. Just need some things people would like to see in this painting that I can improve before I take it to the next level.