Lighting is very important, as optimal light will give the best result. Natural light is best. Place your art on a table or on the floor near a large open window.
Holding the camera directly above and parallel to the artwork will decrease warping. Make sure all four corners are seen in the view finder. Also make sure there are no shadows cast on your artwork.
Resolution is extremely important, especially when enlarging an image. When uploading your art make sure you are uploading the highest resolution possible. If the file is too low, we will not be able to use it as it will appear blurry in the final artwork.