Question:

 What did the painter say to his Valentine?

Answer:

”¡ʇɹɐ, ʎɯ llɐ ɥʇᴉʍ noʎ ǝʌol I“

Citations:

https://www.upsidedowntext.com/

https://thiswestcoastmommy.com/25-valentines-day-riddles/

http://thissweethappylife.com/2018/01/dollar-store-valentines-crafts/