MS-1, BT-2, T-26, and AT-1

This is a picture I drew the day Russian tanks were released on the 360 edition that I kept forgetting to post. This drawing is of the first two tiers of Russians in the game, The tier one, the MS-1, and the tier twos, the BT-2 and T-26 light tanks and AT-1 tank destroyer. Again, curves are a problem for me, but I'm getting better. Constructive criticism is very much welcome. Now, some info on the tanks:

MS-1: The first Soviet designed tank, while unsuccessful, is gave the Soviets their first experience in armored vehicle design. It was based on the French Renault FT, and was produced from 1928-1931.

BT-2: The BT-2 is part of a series of Soviet light cavalry tanks, the BT-2 variation was produced during 1932. BT series tanks took part in several wars between world wars including the  Spanish Civil war, the Winter War, and the Second Sino-Japanese War. The BTs also took part in the Second World War, though around 1942 their numbers were few and were largely replaced in service by the legendary T-34 medium tank.

T-26: A light infantry tank produced during the 30s as a development of the Vickers "6 ton tank". It entered service with the Red Army during 1932, and was used throughout the Second World War. It was also used during the war and post war by several other nations including China, Spain, Finland, and Turkey.

AT-1: In actuality a "Self-Propelled Gun" based on the T-26. Only 8 prototypes were made and it was never mass produced.