This is the 4-1-11 drawing titled “I Need that Color!” It measures A5 or 5.75×7.5 inches. I did a quick sketch with pencil and then used a Lamy Safari with a B nib filled with Noodler’s Black ink for the paint tubes and added the shading with a TWSBI M Nib and Private Reserve Electric DC Blue ink.
Cost is $25 USD, shipping to CONUS included.