When Should You Give Up On an Image?

Today's photo is an example of what many photographer commenters would say is what NOT to do with a photo.  I have had this photo in my "Need to Work On" collection ever since I first took it outside Florence, italy in Feb 2012.  I thought it was a photo with an interesting subject in a fascinating environment.  Unfortunately, the several times I worked on this photo, it just never seemed to make an impact; it was lacking something.  Many photo commenters say you shouldn't keep trying to make a photo work.  If it doesn't work with just a couple minutes of work, then it's not a good photo.  I'll sum up their position with a common phrase I used while in the military; "You can't polish a turd".  BUT, sometimes the image needs some time to simmer and experimentation to find what can make it work. 

Canon 7D with Canon 24-105 4.0L lens.  Processed with Lightroom and Perfect B&W

Canon 7D with Canon 24-105 4.0L lens.  Processed with Lightroom and Perfect B&W