The quickest and easiest way to take good photos with minimal equipment :
Get a cardboard box, like a semi large Amazon box. Get a piece of paper with a gradient background printed on it, and place it in the box from the back to the bottom in a curve.
Get the light you use for painting and shine it into the box. Then get a second light (the one on your phone will do) and point it along the line of the shadows to light things evenly.
Use a camera with a macro mode (not a phone camera). Turn off the flash, place it on the flat surface or tripod to stop ti shaking, then you are done