In this illustration, I put a lot of effort into depicting Nahia-chan's soft and beautiful buttocks. It was quite challenging to depict the round shape that doesn’t have distinct contours. However, this time I used a large brush to illustrate the buttocks. I didn’t use a small brush except for the parts where the skin folds. I consciously brushed in different colors while paying attention to the direction of the skin's texture on the buttocks. As a result, I’m very satisfied with how attractive the buttocks turned out. For the other areas, I first painted subtle color changes and large shadows with a large brush, and then finished the details with a smaller brush. You can check out the process in the timelapse file. I hope you find it helpful.