I'd like to see a portrait artist -- pay for your picture, pose, and you get a portrait of yourself.

Posing would require a little time, and would perhaps require you picking a background and an action. If you don't pick, your action is "is standing" and your background is "here".

Basically, a portrait would be an object that has as part of its description "(yourname) is standing here." -- or maybe something more exciting, if you picked that.

Also, if you look (yourname) when you can reach the object, you should see the same thing as if you glanced at (yourname) at the time the picture was taken.

There should be a variety of different quality levels (and perhaps sizes). If you're level 1, all you should be able to buy (if you had the gold) is a simple portrait with a cheap wooden frame. At higher levels you should have more options -- glossy hardwood frame, polished silver frame, heavy golden frame, etherial iridescent frame, ...

Pictures should be of type treasure, with value based on the quality of the portrait and the current player level. Portraits of deleted players should gradually increase in value after the player has deleted. Portraits should be relatively fragile (subject to dragon damage, if nothing else).

You should be able to buy a portrait of another player, if they'll pose for the picture.

If you're really ambitious, allow for group portraits with each person in the portrait posing (presumably using some social).