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Photo Specs
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HairDesignerTV Certified Program : How It Works
Photos should be 129 x 178 pixels and no more than 300 Kb in data size. Save as .jpg files.
For best results resize your image to 129 x 178 px
There are a number of programs available for cropping and resizing images and many can be downloaded for Free.

Paint in Windows and Preview in Macintosh will do the job.

Shoot in Portrait NOT Landscape
Shoot and portrait with the camera turned 90 degrees clockwise and crop the image to show just the subject.

Make sure you have good lighting and a plain background.
Make sure the subject is well lit and the background is not distracting.
A good primer on photgraphy can be found here

Consider attending a photo shoot workshop. Find out more here.