Another way of asking the question:
Are there any distinctly identifiable features of particular modern airliners that are there for design reasons that have less to do with engineering than with appearance?
Could one look at at a modern airliner, and point out something in its design, however small or large, that is there because "it looked good"?
To be clear about a few points:
By modern I mean since the 707.
In visual aesthetics I only want to include physical form - contours, placement of parts, proportions etc - and specifically want to exclude livery, colour, and so on.
I'm not interested in inessential matters like the design of the interior, but in the airframe, engines and so on.
I'd be pretty surprised to discover that any aspects of design allowed aesthetics to trump engineering consideration, but perhaps there are examples where aesthetics played a part because the choices, from an engineering point of view, were equally viable.