if you're using a mac shade, make sure you use a yellow toned foundation to even out the pinky tones that flash photography brings out in your skin. So a NC shade would be better than a NW shade - this is important for bridal make up etc.
Also, stay away from anything illuminating or with a heavy sheen as this won't photograph well either - sam talks about it in her blog with examples and everything so have a look. There is a link to her blog on the home page i think
hope this helps.