Human eyes are less sensitive for colours in the dark. We then see mainly grey’s and blue’s. If you are making a painting based on a photo, then be aware. Modern digital camera’s are that sensitive that twilight pictures still look pretty colourful. So what to do when you want to make a really good looking twilight painting ….. yes indeed, add the twilight spectrum. Odd enough it’s really easy to change a bright sunlight Hawaii looking beach photo into a twilight photo. Take out colours, only use grey’s (grisaille), add some indigo and cyan and you’re done. I hope the steps are clearly shown via this attached animation.