However doing this gives me the opportunity to see how I have developed my craft over the years. Seeing the photos from before and seeing the photos now, makes you appreciate all of the hours of learning, disappointment, and accomplishments that photography gives you.
Another reason that I don't delete of my pictures is because as I have progress in the craft, I'm learning new techniques, skills, and perspective about photography. And with those new thoughts in my head, it makes me look at my old photos in a different light. I've realized too over the years, that sometimes, you just don't pay attention to some details in the photo because you just didn't know how to pay attention to it.
I suggest to you (the reader) to do the same. Save your photos, work on them, and then a year from know look at them again and see what you see in the photos. I can guarantee that you will see your photo in a different way than when you took it and edited it.
Here's a image I took as part of my 2010 - 365 Project.