I first saw the picture and thought it was about the angels being fed up with Sherlock and bring him back down to earth so they don't have to deal with him anymore. Like, "He's yours, right? Take him!"
THIS. is. brilliant!! ah! i love both sherlock and good omens! and the idea of a crossover (i need an ff now hahah ) gives me goosebumbs all over amazing picture! i love your interpretation of crowly and aziraphale