Natural light

Natural lighting is the best, but only at certain times and in certain places. Most photographers do their outdoor shoots early evening, maybe an hour or so before sunset because the sun is low enough that it won't be too harsh on your subject or look too bright.  Cloudy days can sometimes work because the sunlight is diffused, but I prefer the light to be more directional. If you shoot late enough (or early enough) in the day, that's what you'll get.

Another thing to watch for is catchlight in the eyes. Try to face your subject toward a fairly bright area. The result is a reflection in the eyes that will make the eyes stand out more than if there were no catchlight at all.

If you absolutely must shoot when the sun is high in the sky, try to find an area with some shade.

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