Jay's is in my kitchen, Maple's is in my bedroom, and Tipper and Wolfgang's are in my basement. What about you? If you don't have any, where do you plan to the ones you get?
I don't have any yet, but I plan to put them somewhere nice like a table in any of my rooms. It'll probably depend on the villager's personality and the color of the frame as to where I place the picture.
I only have Soleil's, and it's just sitting in my main room. My house is just where I throw all my stuff, there's no real rhyme or reason to it. I haven't actually decided what I want to do with my rooms yet.
I do plan on starting to collect them, then I'll probably designate a room for them, or a museum exhibit. Soleil actually gave me two right before I moved her out, but of course none of the villagers I want to give me pictures will.