No textures supplied in blend file - File, External Data, Automatically Pack. This does not help to suggest things.
As a result i can’t tell if your tiff image could be used, probably it could but it’s b/w values need to drive mix of materials which would need additional nodes to properly form the mask. Right now i had to paint a new image and used that.
See if you could take over from here http://www.pasteall.org/blend/41928