John's face is great. I think this pretty much sums up the relationship between the two of them; Sherlock does all these things that annoy John while it takes all of John's patience and tolerance to put up with him.
When I saw this drawing, I literally said, "Oh, my god, it's brilliant."
The coloring is wonderful, the postures are fun, and their expressions... The expressions are easily what I love the most. You have absolutely nailed Cumberbatch's cat-like eyes/grin and seeing Martin Freeman's "I couldn't be any grumpier if I tried" expression in such a cartoony way is glorious. The scowl and bear it expression says it all and more. I cannot say enough about how perfect I find this. Great work!