So I decided to go for the purple on the red sunset - very carefully as I don't want to overdo it, nor do I want to create mud as there's already allot of pastel on this piece.  I fee; its giving some depth to the picture and I may therefore also very carefully do some highlighting on the skyline.

I'm on the 2nd layer of paint on the stones - just the fine details to add now.

And today the postman has brought my latest stones - I've decided to work on slate - starting on a small scale with 10cm pieces.