We photographers are very bad at looking at our mistakes.  When we get home from a shoot we are always looking for our best shots and ignoring those that didn't work.

 

Go back over your saved images and look for pictures that did not work successfully.   Examine each picture and work out what went wrong and how to fix it.

 

It might just be an uninspiring picture - in which case how could you have shot it differently to make it interesting?