Note: I drew this in FireAlpaca, which is a free drawing program. You probably don't use FireAlpaca if you're reading this, so, results may vary. Also, I dunno why I drew a Temmie and Asriel fusion thing I was just bored. There's not really room in the project, so here are the steps: 1. Draw whatever you're going to be shading. 2. Identify where you're going to be shading (and highlighting). 3. Begin shading. It can be as simple as a line of darker color or as complicated as... whatever I did in the project tbh. I fixed the wings as well. 4. Then add highlights! Highlights are pretty optional, but a small streak of white or a lighter color is pretty acceptable! I used the airbrush and blur tools and played with the opacity to get what I got here. 5. You're done! I added a background to mine.