RustyM wrote:
Linda, I think you may be on to something with the out of focus drop of water. The light source was the sun, the butterfly was near vegetation, and the shot was taken fairly early in the day when moisture was likely to be present. My camera is fixed lens, so it's not likely to be sensor dust. The artifacts don't show up on shots taken close to the same time, so it is not likely to be dust on the lens.
More information such as this would have been helpful as the EXIF info was stripped...