You want to have the best passport photos so pay extra attention to your grooming before your session. If you need a haircut, have it done about a week ahead. Facial shine is detrimental to passport photos. If your skin is oily, shiny or perspires heavily, you should dust it lightly with cosmetic powder. This goes for men, too.
Conservative clothing will flatter your face. Mid-range and darker, solid colors such as blue, brown, gray, red, green are best for both men and women. Avoid busy patterns, large amounts of white, and very bright colors. You want to draw attention to your face and use your clothing as a frame. Simple, classic styles will not look dated as styles change.