Apples and oranges, I think. Representing yourself isn't in and of itself an artistic endeavour, anyone who's ever been to a job interview knows there's right and wrong ways to act/dress professionally. I'd equate the "image" of a cover band to that. The image of someone like Björk, Nick Cave, Sex Pistols or Meshuggah is something else entirely. For original artists that presentation is an integral part of the art, whereas for a cover band it literally is just a matter of looking professional and not turning anyone off. Two entirely different things in my opinion.