I enter my digital images into many local competitions. Not necessarily looking for high ranking placements, but more to see where they fall on the overall placement of scoring. If a particular image consistently scores high then I know that I have a potential best seller on my hands, which surely will make its way into a portfolio showing at some point.
So don't file that favourite pix under "G' so quickly - get it out there in a few competitions before hastily shelving it in the back files of your hard drive.
My competition places within the last few months (notice a few consistent images that have been circulated) - T :)