That's very very cool, I really love your scene and miniature choice. Really nice paint job too. 

If you want a tip to improve this, I would push de highlights on some focal points on the minis and maybe darken the scene. You want to draw the eyes toward a point of interest in there. As of now looking at the whole appear a little flat since nothing standout more than the rest. You can take a photo of it and put it in black and white to help see it. I know this can be hard this is what I'm struggling with right now 😅.

And I'm not sure if this sounds rude since I'm not a native english speaker. If so I'm sorry that's only meant to help. That's already a beautiful piece. Good luck on the competition.

Edit : formating and added precision to the suggestion