My side of the trade has arrived in Korea, so now I can share the final update 
When I contacted our friend with the card, I offered him money, and I also told him I do original art. He said he didn’t want any money, but he would like a painting of a priest Galarian Slowpoke wearing a clerical shirt.
Without further ado, here is what I traded for 121/S-P:
I’ve just received word from him that he loves the painting, and to “enjoy the slowpoke collecting life always!!”
Thank you so much for following the journey!