Yep, that's the one.
Man sounds like it'll be a lot of work :(
I recommend you use the blackjack cheat (no item needed) to get a bunch of chips. You can get 2/5 paintings with chips, trade the rest of chips for drone paint, sell drone paint at Ebisu, buy enough wooden tags for the painting at that particular casino, and then the VR one is pretty easy.
Use the leftover cash from chips and VR to buy hug bombs to get the SP needed for the last painting.