So @Small_Radishes is having a contest where you can only use one color of your choice and black&white for your image. While this is NOT my final entry, I wanted to test out how I could get different shades w/ only one color using different opacity layers! I used black for the shading plus some parts of the lineart, and used white for highlights. The rest of the image was made w/ only using #0b092b as my color!