I've been working on adding shadows to my artwork, in both drawings and paintings. Adding shadows and highlights has been a learning process for me and I continue to work on it. Once I realized the difference it makes it my sketches, I've tried to add them to all my drawings. The fun thing about shadows and highlights is that there isn't just a singular method to adding them.
The last sketch has shadows, and uses the exact same colors, but there is no blending. The colors are used in order or dark to light with the lightest colors being the parts where the light source is shining. I thought the first sketch would be my favorite, but I think I like the last one. It's unusual and fun to see the colors without the blending.
Here's a side-by-side of all three sketches to show the difference.