A more advanced expansion on my "Basic Tips" article, Basic Tips to Make your Art Look Better. First, let us recap on those basics:
TIPS FOR PHOTOGRAPHING ARTWORK:
Make sure your picture is laid out flat, either lying flat on your desk or attached to a wall. Minimize wrinkles. Set your camera perpendicular (at a 90-degree angle) to your picture. You can use the paper or the canvas' edges as guides against your camera's display to align the picture properly.Unless you have a DSLR with an adjustable flash and are well versed in flash photography, do not use a flash.Take the photo in a well-lit area.
This probably doesn't work if you use a phone camera, but if you use a regular camera and your hands aren't steady enough, set your camera on a pile of book (or use a tripod if you have one) to keep it steady, and use the timer to take the phot