Request any image you want and I'll do my best to turn it into something that looks nice in-game. I'll PM you the png file so you can paint it again as much as you want. There are two options: dithered or optimized. Dithered looks better but you'll need to use a store bought sketch to use the image. Optimized doesn't look as good but can be crafted with pigment and linseed oil.
There's no set price, although dithered will be cheaper than optimized because it's easier to make. Just offer me something like high q stuff, developed skulls, chasm conch shell, gold, pearls, whatever else you think I might want. All I ask is that you let me display the result at Ocean Store's meteorite mansion. <3
Examples of other stuff I've made (all of it optimized because I'm too greedy to buy sketches):