It would be a pencil drawing.
It would be a cartoon of a man doing a head stand on a surfboard on a wave. It would be sunny. He’d be skinny, wearing shorts and with oversized hands and feet. His feet would be facing the sky, but drawn at enough of an angle that you could read what was written on them.
It would say Soul Tan because the bottom of the man’s feet would be getting a tan; and because surfing and the sun and being upside down are good for your soul; and because Boots (the chemist) used to make suntan lotion called Soltan and that’s what my memories of family holidays on the beach smell like.