Cropping for Impact

This is a reasonably well balanced image of a group of Masai women. Even though the focal point (the third figure from the left) is positioned more or less centrally, her angled face pulls you in.
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Ultimately, developing your post production cropping skills will help sharpen your in-camera framing – take time to experiment on one image to find out what crops please your eye the most. Then take that knowledge and experience out with you in the field and use it to crop in-camera, making use of every pixel on your sensor.
Improving composition

As well as correcting for shooting errors, cropping on the computer also allows you to fine tune the composition to produce a more balanced image. While helping to cover up a mistake, you might find that one of your people shots actually benefits from a more concentrated focus on their face, or removing disproportionate amounts from the edges of a frame moves the centre of interest to a more dynamic location according to the rule of thirds. These are decisions you’ll make based on your particular style of photography - you might be a rule breaker who wants to learn then
By cropping the image to reposition the focal point in a position closer to a point of power, the photograph becomes stronger. The emotion in the women’s faces is more concentrated.