Nic Thurman on Instagram: "Keys to the sanding technique for oil painting. 1. Pay attention to what you’re actually doing on the surface. This isn’t drywall being patched - it’s an oil painting. Be careful with how much you sand. 2. Use a mask and avoid sanding indoors to prevent dust inhalation. 3. Get a good grip on the sandpaper so you can feel the amount of pressure you’re applying. 4. Sand in a vertical direction so that the marks blend in with the light. 5. Sand in the shadows, transitions