Make sure the background you choose complements the subject of the photo. If you take a photo of a model against a busy background, the viewer's attention is going to be drawn to the background rather than the clothes. As a general rule, simple backgrounds with colors that contrast with those of the subject are ideal.
Take your pictures quickly. The longer you hesitate, the better the chance that your subject will move away, break their pose, or become tired and stop smiling. Start taking shots as quickly as you can, and don't worry about getting the camera perfect before the first shot. The faster you shoot and the more photos you take, the better your chances are of getting a good one.
When working around subjects that are moving a lot or are totally in action, you need to focus on capturing the moments by keeping your trigger down. These kinds of moments can not be recreated and there are no do-overs. Keep your eye on the areas at all times and keep shooting.
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