Basic building and painting are good and the scenerey is very well done.
I agree with the comments on the too casual figures, especailly the guy with his rifle at port arms. With that much fire, he'd be doing a runing crouch to the sea wall as would the kneeling guy.
The tank has left no tracks in the beach and , I believe, these vehicles had wading snorkles or the exhaust.
Your wave effects look under scale, The white water of the breakers look way to narrow and it looks like we're seeing them from an airplane, I know water isn't easy. but even walking, a man will leave a wake in water.