You may be mistaking the use of image and smart image (I did this once or twice already myself---ok, about 5 times now).
Image, when revealed to the players will show the full portrait.
Smart image, when revealed to the players needs to be prepared. This is the image type that you want to use to reveal to players specific parts of an image (maps, etc).
I use image when I have a picture of someone or something (exterior of a castle for example) that the players should see the whole image.
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