First of all I want to thank DSDF for the idea.
I prepared the pencil copy and it stood on my easel for few days. Walking around it I was planning to draw long (as long as arm's length allows) vertical strokes as the main line of the painting. And I wanted it to be done in pastel (easiest medium the vertical lines!). But when I started, I realised I was copying the photo and it led to nothing. I saw it in time to start anew, with desired long strokes, relative shapes and colours. And then I liked the result.