This is one of the wallpapers that caught my attention when I logged in today. For one reason, the thumbnail is very eye-catching wherein the character stands out because of its coloring. Upon closer look, I was amazed to see a lineartless artwork. I love the red colored Kimono and its patterns.
However, I think there are a few parts that can be improved, like the eyes of the character as well as adding textures to the black part of his clothes because it looks too smooth compared to the red one that it doesn't look like cloth/cotton anymore. The BG could use a bit more work especially the bluegreen parts on the left. It is kinda distracting that it looks incomplete. I was actually imagining a garden on them or a grayish wall instead if you don't like to do the BG anymore.
All in all it's a nice attempt! Keep it up!