I like the 1/72 scale myself. They do not take alot of room and do not cost much.
Biger the scale more work and more cost. Your dio looks great. The building is not
realistic. For me it is the windows they look 2 round. Just an idea add some glass
to the pane of the window and on the ground. A little colour on the building may help.
This is only an idea. One thing about dioramas you can change them any time.
Since you won you may not want to change it.
djw1
ARTE ET MARTE