Values

Colours

There are two main light sources; one from the sun roof and the other from the stairs entryway. The sun roof's light is reflected on the tree brances and leaves, while the light from the entryway lights up the stairs and the small open corners of the roof.
The speculars can be found on the wooden rods from the roof's structure, as well as on the leaves from their grey container.
The focus point is mainly on the tree, and it's been centered and almost framed by the sun roof's structure for emphasis.
There's a bit of a warped 3 point perspective in this layout, nothing strict.
There are elements of rim light on the tree branches, the leaves and the edge of the plant container.
I played around with a more cool coloured hue, but added a little bit of an orange to add to the brightness of the light sources. The earlier versions of this layout were more desaturated, but in order to put a bit more energy into the grey environment, I intensified the blue overlay that I had.