Vodou is right about the shipping time. Wrong about the refund, IMO. If the artist refunded part of your shipping costs, he's trying to do right by you, as I see it. He doesn't sound like a take-the-money and run kind of guy. "Force" a refund and I can imagine how little he'll want to do with you in the future.
I've bought directly from two artists in Brazil. Neither packed their art well the first time, but everything survived relatively intact (a minor, easily-flattened fold on the corner of one page).