I could really use some help with this one. Its a battlemap for an upcoming encounter in my campaign. In it the party is descending along a narrow ledge that leads down a shaft into a deeper cavern. There is still a fair amount of detail work to be done but I would love suggestions on how to create the illusion of a ledge spiraling down into the darkness.

Attached is the image of what I have come up with so far. Suggestions welcome!Click image for larger version. 

Name:	Ledge down.jpg 
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