I don't like the hexagon shape of the turret. The lower section of the turret shouldn't be angled up so high.
Note how small the underside is; if it was large, a shell hitting that side would be deflected down
into the tank. the point of angled plating is deflection
away from the tank.
you might also want to lower the height of the turret as well; use the image for a comparsion. usually turret = .7-1.0 times the tank base height, .7-.9x the width of the tank (for modern ones; the one depicted is a russian WWII tank), and is centered for tank balance.