Your dio looks really nice Joe.
You've pretty much nailed the uniforms on your figures. Flesh and faces are very difficult to do. Most of the members on here say that they don't like their figures but they turn out pretty good. If you want to learn more then I suggest trolling through the site and buying some books on figure painting. I started with the Verlinden Way and have bought more books like How to Paint Realistic Military Figures by FSM.
I like how the crew is all interacting. The Commander talking to the other soldier, the three on the ground with two looking off to the distance like something has just caught their eye.
The Panzer is nicely weathered but you might want to pay a bit more attention to the running gear especially the road wheels. They have some mud on parts of the rubber but the rest is too clean and shiny.
The problem your going to have with the display case is unless you built your base to fit one you'll have to make your own out of perspex or glass.
Best of luck at College and don't forget your hobby when you start geting distracted by "other things" ie College Girls .
Cheers, John