One of my students was painting a sunset and had started with the dark clouds, planning to add the colour later. This was a really quick demo to show her how it is better to get in the luminous colours first, so that they then shine through thin layers of cloud - just as it works in life.
So .... messy and rushed! but hopefully it showed what I meant, with the underlying glow shining through the clouds. If elements have to be luminous and full of light then I try to get them down first whenever possible, whether it's sky or leaves against the light.
This was done in the S&B Zeta sketchbook.