A photograph consist of two parts, a foreground and a background. When you need to convey more attention to your subject (usually in the foreground), make the background work with the foreground. Very important bantayan ang color harmony, ang highlight and lowlight objects.
Very common mistakes in portraiture ang background objects murag mitungtong sa ulo or na merge sa buhok sa subject, meaning ang foreground ug ang background nahimong usa at some area. In portraiture specially outdoors, one can improve the output kung himoong half stop underexposed ang background than the foreground. This will give more emphasis on the subject/foreground. Isolate the subject from the background, that way lutaw ang subject ug naa pud iyang space ang background. Managlahi man 'ta ug style but this one works well most of the time.
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For technique, I usually recommend this site:
The Golden Mean
dako ni ug ikatabang sa nag tuon ug himo ug maayong photograph.