Wow! Great color palette, wonderful Victorian feel, and a wise-guy kitty on the couch too. I have 3 minor quibbles: the highlights on the cat's cheeks look like spectacles; the one object outside of the color palette is a ball of yarn, and I don't see any good reason to make it stand out; I hope you're not referring to the Robert Downey Jr. movie version. If you're truly interested in Holmes, you can still get ridiculously inexpensive copies of The Annotated Sherlock Holmes by William S. Baring-Gould. For the slightly less ambitious (this is a large 2-volume set with all the stories and novels), Baring-Gould also wrote Sherlock Holmes of Baker Street.
If you'd like to branch out to a later period interior, why not Nero Wolfe's brownstone? (Novels by Rex Stout--to the best of my knowledge nobody has annotated Wolfe yet.) According to some fans, Wolfe is the illegitimate son of Irene Adler and Mycroft Holmes (Sherlock's brother.)