You don't think it's too busy? I do like the contrast. Here's a test render with the character added.

Decided on a dark red leather chair instead of the black as the other was a case of right colour, wrong design for what I had in mind. Certainly much closer to canon than that blue fuzz covered thing he was sitting on in the first version.

Much more blending and painting and other little touches left to add, but it does seem to be an improvement.