Hi Ross sorry I dont think this really works graffiti is normally bright bold colours to make them stand out and if they are black and white the background is used to make them pop, also the light from the door has burnt out the bottom of one of the tags.
Have to agree with the above Ross. How do you convert to B&W? This looks quite dull and grey, some more contrast might help get that pop. I would also look at adjusting the perspective so that the door frame is vertical.