Familiar 75mm AT gun by Tamiya & crew!
Liking the progression of your display. The AT gun in a defensive roll was most effective camouflaged. A few bushes on the top side - think Normandy hedge and a camouflage net over the gun, leave the gun sight clear to view.
A few more tweaks and call it complete. Look at other modellers work and always check reference photographs. Your next project will always be better!
One more thing to consider changing: The 75mm shells leaning on the ammunition box would not rest at a angle like that, the would roll off. A lot of modellers place the shells on the ground resting on a tarp.