Assuming that You want to play the Flames of War... since You are in
FoW part of his forum

... ALL mortars should be on medium stands (three dudes, one mortar).
Light machineguns and (again I am assuming that Soviets are based similarly to Germans) should be based on medium bases together with 2-3 other dudes with Mosin Nagant rifles (You actually need the
PSC Soviet infantry box for this as well).
HMG Maxims
probably should go on medium base and there should be one more dude with Mosin Nagant - I stand to be corrected, if Maxims go as an upgrade for rifle teams.
I dont know about Simonov's anti tank rifle, but German Panzerschrecks have either an option to be on the medium base (anti tank team) or as an upgrade for command teams (small base). So looking at Your pics, apart of mortar in the middle, the rest are based wrong.