This picture taught me a lesson of beauty. 

I was walking around a dirty old pond, looking for ways to practice with different depths of field.  The dragonflies were buzzing around, landing here and there for a break.  This picture works for me because the background is not in focus.  In fact, the wings are not completely in focus, but that helps add dimensionality to avoid the "subject plopped on a blurry background" aspect.  

It was great to realize I could get such a striking photo in a location that was so suboptimal. 

This is a gorgeous 12-spotted skimmer.