I think you forgot to convert into b+w some tiny part in blue and orange right next to his foot ... or at least that is a part that pulls my eyes and then does not let them go.
And the weather looks like actually this could also have remained all colour and we would not see the difference ... ok, the trees in the lower background are actually green these days...
What I like is your point of view. HAVE his hands and feet been made this large, really?