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So I'm determined to learn how to show elevation better on my over-head maps.

The rough-out (above) has been color-coordinated to show the three elevations that I want to try. The white area will be a ledge and higher than the base level (uncovered in the tunnels). The blue area (a subterranean pool) will be one level down from the 'base' tunnels. Then there's the grey area (a deeper pit) that will be two 'levels' down from the base tunnel level.

My initial attempt will be to establish the light-level of the base tunnels (which is already present in the above pic) and then add a white layer (soft-light) for the ledge to make it look like it's a higher elevation. The pool will be given a darker layer (soft-light) to give it depth and then the pit will be given another darker layer. Hopefully it won't be too dark to tell the details.

Wish me luck!
-GP