Lighting- Make sure your project is well lit! Take a picture of it outside in the day if you don't have good lighting inside.
Focus: Use a tripod or something to hold up your camera/phone so it doesn't move while you are taking your picture
Background: Make sure your background is neutral, preferable white with nothing else in the frame
Cropping: crop your image so you can't see anything in the background
Editing: Fix the color and lighting on your photo. If the photo has a blue or orange tint, change it!
Tip for 2D work: Scan it! Many at home printers have a scanner!