I pulled out these three sketches that I did while we were in Las Vegas a number of years ago (see post on 21 November 2014).

Early Morning Mountains I
I thought I would start by indicating the top line of each of the mountains that would be silhouetted against the sky.

Dark Mountains I
Then I added the some of the lines for the lower mountains below the high points.

Mountains I
I will post each of these paintings at a later date as more work on them has been completed.