I can imagine that the black exterior would possibly be more difficult in some area's for the spanner turners. Small fluid leaks streaking back under a belly for Eg might not be so obvious during a walk around in the rain at night even with a candle. Still looks impressive though & that's the only reason it's like that I imagine as we are all visual creatures:-)
As for the design/shape? The nose kinda reminds me of the Comet, also doesn't look much diff than a 767 overall. Will be interesting to see when the 350 is in service, bigger & am sure the 'Bus' Co are learning from others misfortunes.
Wmk2