Hi Mary. See if you can get yourself copies of Concord Publications Armor of the Korean War, and Squadron Signal Publications Armor in Korea 1950-53. Both contain B&W photos and color profiles of vehicles and equipment. Cost effective as well, they are both inexpensive ($12-$14ea)
I recommend both of these as good quick reference for your diorama build. Lots of in-action shots, and the "field conditions" in which both the troops and vehicles fought.
Check them out
PROST !!
Alpen