Which is Better for Sales, Full or Partial Photos?

http://www.ravelry.com/patterns/library/the-elsa-hardt-shawl

I get pretty consistent advice from everyone that patterns must include clear photos which show the whole garment. I also often include stitch detail shots for added clarity. I've recently started testing out my first Ravelry ads using those clear photos. So imagine my surprise when another designer recently told me she has been experimenting with purposely unclear photos that are artsy instead.  She says she is getting the strongest click through on partial photos in her Ravelry ads. Does this mean I need a different photo for the ad?

http://www.ravelry.com/patterns/library/the-elsa-hardt-shawl