Thanks Chashio. This was all done on one layer. Part of the problem is I have learned how to use PS on my own by trial and error and I don't seem to grasp the use of layers. I understand the concept, but I seem to have a mental block on how to implement layers. The basic cavern shapes used the clouds to mask and erase, but then I had to go over all the edges by hand with the pen tablet to get rid of edge artifacts and add in the stalactites and stalagmites and water.