Thunderheads - A Work in Progress

With all the rain and thunderstorms we have been having I thought I would like to do more thunderclouds.

Using a grey of French ultramarine blue and burnt sienna I brushed in the lower clouds.

Adding a little more burnt sienna to the grey mix I painted a layer of darker clouds behind the grey ones.

Using pure French ultramarine blue I brushed the sky into the background behind the clouds.

I will probably add some tree tops into the foreground and I will post this painting once it is completed.