I was looking at pictures of Yayoi on tumblr and saw this art of the author of Ika Musume! Yes, I know she is old, but I had a sudden desire to paint it! XD
The image above is completed, below I show how I did.
1. Original art:
2. Edit - The whole image is transparent, leaving only the lines:
3. Coloring the image:
4. Add shadows to give depth to the image: