Ok.... I did a bit of digging around on
(a) how to paint stars, moons etc... I had been curious about dealing with light sources in dark skies; wondering about mediums to do this in best, etc.
(b) changes in hue, temperature and mood as the sun sets.
I found a bit on each of these, but above all, I stumbled into a lively discussion on WetCanvas on plein air painters who paint by night. Here's a keyword search on the forums with 'nocturne'.
I also found this demo here on the artists' network site
It throws up all sorts of new questions around practicalities of how to paint at night, mix colours, use headlamps etc.
And, then of course, I got reminded of the current exhibition at the MoMA on Van Gogh's Colours of the Night. Brian had not long ago guest edited a review on Casey's Pastelblog.
The MoMA has a great online resource of the exhibition, if you follow the link here.
I've got a couple of sketches of evening scenes that I did over the past few weeks. They are all in ink, and I need some time to play with hues for them. But there are a couple of points on how to develop this. It'll go into my luggage for next week.