Here is a technique I learned many years ago to help me quickly select my “keeper” pictures from hundreds of images shot in the field, thinking "I'll choose the good one later". Well, the more pictures you shoot the more time it takes to weed out the good ones, and after awhile you find you're spending way too much time in front of your computer.
This technique is drawn from my days of shooting slides the same way (hundreds at a time and I had to pick just one or two). The technique? Put as many slides on my light table as I could, take off my glasses, and just look casually at a distance for the slides that just leap out at you. Those will be the slides where the light is good, your composition is strong, and you have no distracting backgrounds. And it's really amazing -- usually in about 2 seconds you can find your winners, without having to spend time scrutinizing each shot. This is how photo editors choose images, too, so you might as well start thinking like they think. It's a good habit to develop.
Can this slide technique translate to digital photography? Sure! Just use a program that shows you small thumbnails as in the example below. Without having to look very hard, your good compositions should instantly be self-evident. This is your first-pass; after that you have far, far fewer images to scrutinize for sharpness or good expressions.
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