Nothing wrong to set a high price if OP is truly confident. OP can instead sell it in physical stores but the decision has been made.
Good luck to you OP. Hope someone is willing to pay that price.
Maybe... but still, 10 ETH for some arabic calligraphy on canvas is too much. I don't speak arabic so i don't know what it says, maybe it has some religious meaning and might be worth that much to someone. But not to a regular joe.