Impressive piece of work!
You have no doubt spend a lot of time on the figures, and it has paid off.
You've done a fine piece of work on the diorama aswell, as it can be viewed from all angles.
Now to some constructive criticism:
a) It looks a bit too crowded. The scene is both hand-to-hand combat and gunfire, but you could easily remove some figures, making the rest stand out. The figures deserve the attention - again, the work you've done is really good. By removing some figures, the diorama will become larger. This is one of the good things by making dios in 1/72.
b) I am not an expert in japanese vegetation, but it looks to large. Modeltrain companys (ex NOCH) should be able to provide you with some alternatives.
c) Try photograph it outside in the sun...
Thanks for sharing your work, and I hope the above will be useful for you.
Cheers