I love the dynamic poses and the sense of urgency of the soldiers trying to stop the beast, aiming for pistol ports and openings. If there is room for criticism, then I would tone down the silver on the machineguns (too bright and clean), the German machine gunner is too close to the tank to shoot without hitting his comrades, the spent shells in the mud - where did they come from/ too clean, the grenade is not clear - is he throwing, catching, dropping it?
Otherwise the tone, the paintjob, the poses - all superb. Really gets the story of the Germans first seeing a mark I and trying to fight the unknown beast. Great job