@Givemelove: My general understanding is that art mode is more energy efficient than ambient mode. Do the Samsung ‘The Frame’ TV models have both ambient and art mode? If so, then indeed there would be a difference. This also means that, based on the current Samsung SmartTV app for Homey, there is no option to put the TV in true art mode (only ambient mode).
@jco : If indeed The Frame TVs have both modes, then you might want to reach out to the developer of the Samsung SmartTV app (via the forum section: [APP][Pro] Samsung SmartTV) and ask whether he would be willig this add the ‘Send key’ option for art mode, assuming it is available in the TV’s API.