Answer:Intrinsic motivation
Explanation:Intrinsic motivation refers to being internally driven such that whatever you do you are not looking for external rewards but internal ones.
This means one engages in a behavior that is is motivated by internal rewards which satisfies that individual. In works opposite with extrinsic motivation which a person does something because they are yearning for external rewards such as getting paid or promotions
Rudolph paintings isn't being sold that much however he still put as much effort which clearly means he get satisfaction in doing it.