This looks pretty good! It’s simple, but eye-catching. However, there are a few things you could change.
I suggest more variation in the colour. For the main structure and decor of the auditorium (not including the trees), you’ve only used 3 different colours (red, white and brown). It would have a lot more variety if different shades of reds and browns were used, even different tints of white. I also recommend using different textures other than sand, again, to add variety and contrast. One more thing, try rotate the trees and move around the windows so they don’t all look exactly the same.
Good luck, and keep up the good work
I agree with snzzyems, about the colour. I would try and add some more texture and colour variation and personally some more depth. As well as your pathing textures are running in two different directions rather than parallel. Some fixes for this could be unioning, or there is a plugin called texture flip I believe. Overall I really like it, keep it up!