It's always so interesting for me to watch different artworks by the same artist along the time. I think some artists (the artist I prefer :P ) use to explore new techniques and themes and surfaces not just to improve their skills, but also to improve their imagination and the ways they can represent ideas and thoughts. A good artist perfectly knows, I think, there's always something new to learn. The piece in brown and other colors, full of details, is so beautiful, but I like so much also the others, especially the one in ink. ❤️