Background
Take a picture standing against any solid color background. The background should be free of any patterns or irregularities. Make sure that the background contrasts with your hair, your skin, and your shirt.
Clothing
Wear contrasting clothing (if the background is white, wear dark color clothing).
Hair
Make sure that your hair is neat and straight. Your hair cannot obscure your face, and should not cast shadows on your face either. Also take care that you don't have any stray hairs sticking out.
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Camera
Use the highest-quality digital camera that you can find for your photo. A dedicated digital camera or DSLR camera will tend to produce the best results. Keep your head raised and level. Look directly at the camera. Do not tilt or rotate your head.
Lighting
Use a well lit room, without overbearing lights. Natural lighting is best.
The Signature
You need to do a signature by using a black sharpie pen on white computer paper. Take a picture or scan.(min 150K and max 1MB in file size).