Clive,
I like the work and keep dropping back in to take another look.
What I wrote about the shoulders being hunched was merely in comparison to the photo. There's nothing "wrong" with them in the painting, and in fact they convey another teen mood (besides "laid back") that I've been privileged to witness around my house of late.
That being said, I do think his left arm (on our right) looks very narrow and disappears unnaturally quickly around the body. In the photo we're actually able to see part of the arm above the elbow, before it goes into the bell of the sleeve. (Where I previously said that the shoulder might be short, I now think it also has to do with the visual absence of the upper arm.)
Reiterating the earlier comment about darks, I think you'd especially profit from letting the shadows on the floor and wall get darker as they approach the physical items that are casting those shadows. For example, if right near the bottoms of the chair legs you darken the cast shadows on the floor, you'll sit the chair down on that floor and avoid a "floating" look.
I like the yellow/red/orange and violet/gray color scheme, too, in terms both of complement and temperature. Whether you did that by design or intuition, keep doing it.
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