This is brilliant. I like the way you set up the opposites/complements here: night and day, healer and drug addict, country and city, sunlight and fog. Plus you draw both men with something they no longer need: John with his crutch and Sherlock with the skull that was his former confidante. Also, I like the way you echo the shape of the London Eye in the sun and the cobweb. Your picture is thematically clever and visually arresting. Well done.
Ah, this is beautiful. What a collage! The symbolism is impressive, and I see what you did with light and colours there. At first I thought the skull held blossoms, discovering syringes was sadly ridiculous. Great job!