Thanks for the kind words KartoonHead! I actually am using depth biased alpha on both the fog cards and on the ground fog (so it doesn't clip into the eggs). I think maybe what you're seeing is the silhouette of the walls looking a bit too stark with fog right behind it? Maybe I can finesse the placement of the fog sheets…
I'd LOVE to see a breakdown of how you put this together, the whole thing looks really seamless. Fantastic work! One issue I take is with the fog you have in the tunnel; you can see where the sheets intersect with the walls. You should use a depth-biased alpha node to fade out the fog where it meets solid geo. Great fog…