You can see light coming in from the right - it is a very dark day, so quite hard for taking a shot without flash.
This was an experiment using the diagonal as a design base and then developing a landscape from the evolving format.
I had just been watching videos on using interactive acrylics (which react just like oils - enabling blending etc.) doing all the things my acrylics cannot do! Still we enjoyed ourselves painting over another piece of old work.