I'm not sure how many bricks you have to work with, so take these comments with some salt...
Well, the mine looks more of a modern oil well/derreck than a Dwarven mine. The baseplates make it a little confusing, it's hard to see where the "mine" starts other than the equipment and the raised parts. Perhaps some better landscaping, ie, trees, flowers, small hills of grass.
If this were my MOC, it would be a rough draft for me. I would use this in getting my overall layout set. The next step would be to remove the prefab raised baseplates and build up the landscaping with rocks and or grass. The trees I would make small as to indicate that this mine is hidden in some high altitude mountain vale. But that's my opinion.
The elves look more like mercenaries or an outlaw band. I wouldn't change them; they look good.
I would put a cover (like a bedsheet or table cloth) over your table that your MOC is on, as there are some "choice" words etched into the table surface that may not be appropriate to all audiences here.