Here is Van Gogh's Starry Night over the Rhone.
The first thing I notice is the way the sky changes colour to indicate atmosphere. As interesting as that is to compel the eye into the distance, those yellow reflections in the water are amazing! Let take a look how he transitioned from the reflections of light to the dark water. Going from yellow to orange, no problem, it is a smal leap, but how to go from yellow to blue ?
If you look closely you can see the yellow green which acts as the bridge.
We can see the same trick in the sky with the stars and their green halos, although yellow green has been used, a most strident colour, in this setting it acts as a neutral transition.
Let's look back to the shoreline, see how the distant lights are yellow but the ones closer are warmed with orange.
The dock or landmass at the foreground is just a lighter version of all the colours used in the work. Lighter makes it actually seem to float out to meet us, make us a welcome part of the scene.
The figures are barely noticable making the water the real star.
You can notice a shock of hot pink in the dress of the woman, but honestly if you were at a dock at night with strong lights what could you see of figures. This treatment rings true.
Light and dark, oh yeah it is all going on.
Contrast with temperature and saturation ?
Yes it has it all.
A leading lady ?
An interesting composition ? You bet !
What do you see ?