From a user experience design point of view, what would be a good way to let the viewer know, or better said, I want the user to "get it as he sees it" without further explanation that what I am showing is not the whole image, It is just a crop(ie. a small area of the whole image). But at the same time the user needs to know that this is part of a bigger image and he need to have some hint about how much of the "unseen" image there is.
I need some examples.. advice, you can be broad... give examples from other fields.
I am attaching a screenshot of what I have so far, the way I did it is that I added a frame of the whole image, and then inside that frame there is this crop I was talking about.. But I am not so satisfied with the result, I am out of ideas. Any help is much appreciated.
More of the image will be revealed as the user interacts with it in different ways.
I also asked this question on the Graphic Design StackExchange website.. I'll find a way to link the answers if something good comes out of this.