Hi,
I'd like to say you've made a good energetic start to diorama modelling and well done so far.
A good diorama tells a story, and a big part of the story is the enivironment and terrain the models are set in.
Terrain varies quite a lot, even in a small area there are a lot of shape and texture changes.
Setting the scene is also an exercise in logic - if there's an MG dug into a trench line, does it have a credible ammo supply, for instance..?
There are some very good books about fortifications on the Russian Front (
Osprey do a good one) and internet searches can be very rewarding when looking for reference as well.
Looking closely at real things can give you some insights into diorama planning.
Use decent amounts of stuff to set a scene - it's a great hobby and there's some very good diorama and accessory kits around.
For now, there's always something on the market that's 'better' than last year, so don't let your stash get filled up with Tamiya Jerry Can sets from the 1970s...
Stash economics is a whole different discussion.
The best advice?
Just keep modelling.
regards
acav