You've certainly met the challenge - shadows do play an important part in creating the atmosphere here.
The overall darkness is nicely balanced by the bright blues and the outside scene. The bright floor area to the left and the bright outside area to the right maintain this comfortable balance.
Comfort is a key term. Apart from the single leaf (an oversight?), this is a traditional shot. You haven't taken any risks. Even the border smacks of conformity. This is not a bad thing - it places your intention squarely within a given convention.
The textures on the walls have been brought out nicely, as have the clouds and trees.
Interesting shadow play inside, and a great view outside. The leaf on the floor is a distraction. If it wasn't deliberate, it should have been picked up.
Peering out of the shadows, nice use of negative space. Wishthe trees had had better color for you. I like that one leaf on the floor - it would be really cool if it were bright red or yellow - connecting the abstract world of light and shadow with the outside world of trees.
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