Visual looking is an action out of world applying to nothing. Understand "pic" or "picture" or "show pic/picture" as visual looking.
If you’re going to do this for every room, you can make the image a new property.
A room has a figure name called the visualization. The visualization of a room is usually the Figure of Default Room.
Figure of Default Room is the file "null.jpg". [This can be anything you want, it won't be displayed.]
Carry out visualizing:
if the visualization of the location is the Figure of Default Room, say "Sorry, there is no image for this location.";
otherwise display the visualization of the location.