This looks insanely massive compared to modern tanks, but comparing dimensions it’s not so different from modern battle tanks. In meters (length, width, height) this tank is 7.4, 3.1, 3.9; that height is to the top of the turret, the dome behind the soldier. A Leopard 2 is 7.72 (hull, not including gun), 3.75, 2.48; an M1 Abrams is 7.93 (hull, not including gun), 3.66, 2.44. So the main dimensional difference is it’s a lot taller. I guess maybe how built out the hull is makes a difference; the Fiat 2000 had a crew of 10 where the modern tanks I listed have a crew of 4. Or maybe the pictured soldiers are tiny.