You need to use our template, to use pre-existing art please see this tutorial.
Make sure to have a good source of natural light, outdoor lighting is best! Sunny or cloudy it’s the same. Please do not use a flash.
Pay attention not to photograph your phone shadow, or any other shadows on the template. Avoid wrinkled paper if possible, wrinkles leave shadows, too.
Make sure the picture is nicely in focus and sharp! The sharper the picture, the better the dress!
All recent smartphones have really good resolution, anything above 5MP or minimum 800 x 1000 pixels will work great.
Get as close as you can to the template without cropping any part of it out of the picture (be sure to get the name in there!)