I pulled out this set of the four seasons that I had started a couple of years ago (see post on 14 April 2015) and wanted to put the sky into each of them.

Spring 3
The first one I put in a grey sky using French ultramarine blue, burnt sienna and a small amount of alizarin crimson.

Summer 3
On the second one I used a mix of Antwerp blue with a small amount of cobalt blue.

Autumn 3
For the third one I used a wash of cobalt blue.

Winter 3
On the last painting used a mix of Antwerp blue and French ultramarine blue.
I will post each of these paintings at a later date after I put in the land on each side of the road and the roadway.