Guitar desing - no way back

Now it's on. Drawing directly onto the slippery surface of the gutiar, I understand how people would want to do the design on stickers and paste it on. But this is the charm, not if, but when I fuck up a line, I have to start using my head. How can I make this look intentional? Now I have to take this black and white illustration "far of", completing a psychedelic desing for my friend. I also tried to use a injury of the guitar composing the wond on birdy her.

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