ok, bill structure is striking as being high, with a strong gonys and a blunt tip. head is toatally white, most LBBGs usually still streaked. and then it is the pic itself which is made in sunlight. under such conditions you can get strikingly different grey tones, even if not in full shadow. my experience from pics tells me that a (generally more slender etc) LBBG would appear much darker than the front bird here is. and concerning wing pattern: LBBG have on average more black in outer 3 primaries, here there is a large gre basal part to them.