That's starting to look a lot better. You've got a nice-looking dio started. Your figures look good.
Couple comments: the you might want to reduce the height of the bunker roof. Remember the guys who built it would want it to be very hard to spot.
Your NVA (or VC) trooper should probably not be a tank crewman. NVA use of tanks in Vietnam was extremely rare, and why would a tanker be in a bunker anyway? Just make it an ordinary VC or NVA soldier.
By far the most common VC and NVA small arms would be old US and Soviet bloc arms like the AK, SKS, PPS, M1 carbines, M16s and even old M3 greaseguns. French weapons like the MAT49 were also used. Most of those weapons are easily found in figure sets or by asking here for a donation or two. Using the ex-German weapons again sort of raises questions that distract from your story.
The whole story pretty much depends on the figures so make sure a viewer can understand what they are doing without any explanation necessary. One easy trick is to have them all facing in the same direction or looking at the same thing, so there is some focus. An alternative is to have them all looking at one guy who may be talking or perhaps holding up some object like a captured map or something like that.
Your work is far better than mine was at age 16 ! Keep it up, the more you build the better you'll get, and soon you'll be showing all of us how it is done.
Danny Egan
AMPS
http://www.amps-armor.org