Good points about the shadows. Maybe it's not achieving what I mean it to.

See though we're seeing the whole map in the dynamic lighting feature of Roll20 the pcs will only expose small sections at a time. And with multiple light sources every nook and cranny will cast compound shadows.

Also hoping to use this as the grime and muck that gets into the corners.

But will take on board your points, and consider reworking that effect for future builds.