The dirt seems like it would need to be darker if you are going to have it be a damp setting. You can have the barrels sink into the ground a bit. I’m sure you know that you want to have fog in there for the misty feeling. Maybe you could have there be a figure that looks like it is made out of fog at the beginning of the fog. You can have a glow coming out of the cracks in the barrels.
These are just ideas use at your own risk…
