Here's my tip for making decent-looking fine art/photographic morphs: it helps to use paintings by artists who work in a very hard-edged, linear style. Bronzino always works well. Elsewhere on this site you'll also see a lot of Early Netherlandish art for the same reason. If you choose to use something very painterly like Delacroix or Veronese, you're just making trouble for yourself. So, basically, in the age-old Poussin vs. Rubens debate, I tend to side with the Poussinistas.