Love the style
This style would make for an awesome animation. Where is he? At his flat? In an institution? I agree with Krinkels about the pain killers, but why stop there? You could also have, if he is in a ward, some overtly crazy people outside the window, meandering around an overly-picturesque rose garden, complete with the statue fountain of the little boy pissing out the water. Certainly you can stick to your color scheme with that.
Or, if he is at his flat, in addition to the pain killers you could have a bottle of anything 90 proof or above, a smoldering cigarrette that looks like he's been holding it a while, overtly bloodshot eyes, maybe a pistol, or a knife, a deck of cards laid out in solitare or something, with the queen of hearts in plain sight, or maybe an ace or queen of spades. He could even use a scar somewhere on his face. Just a thought.