I wasn't sure about posting this one as the easel fell over (it was on a slanted harbour wall - The Cobb) and the painting came off the easel and all the solvent spilt onto the painting! This is a photo of it before it was ruined, but thought I'd post it to tell the story!
NB don't wipe turps off a painting as you wipe the painting off too!
I did this study that evening sunset, I tired out my new lights they work really well for nocturnal/sunsets. You can buy them from Amazon as orchestral or reading lights they come under.