Coming together nicely, really interesting to see your concept develop as you go along.
Would be good to see you work in some other colours into the stonework once you have the minis painted. I can see some hints of green in there already but definately worth taking a look at some reference pics of cliff faces and carved stonework, look at how water, minerals and natural staining can affect the colouration of the stone.
Cool project, looking forward to seeing how it develops.