Matted and framed? RA4 or ink Jet? Dye or Pigment? Machine made or hand made? Traditional B&W? Bodyscape, counter culture, flowers, landscape? Hand signed or dropped shipped?
You should start at $499 and go down from there.
This print, 10x13", sold for $3 million. So who can say for sure: http://en.wikipedia.org/wiki/File:ThePondMoonlight.jpg