I like the fall colours of the pumpkins, but not the print. A duck in a pumpkin patch just doesn't make sense to me. I like the way the colours accentuate the duck, though. I think a print of trees in autumn would be great. (...it's helpful when people suggest fabric you don't have, right?)
Of the ones you have, I'm torn between the colours of the pumpkins, and the appropriateness of the sunflowers. Either would be good. I really like your duck, though! It will be great in any setting.