Look at http://en.wikipedia.org/wiki/File:Dnepr_motorcycle_IMG_1586.JPG I have edited this image to remove a pavement which I found distracting, and recreate a part of the front wheel which was missing
If actually editing an image (not merely adjusting levels, but actually changing the content of the picture), I would expect that people would detail all doctoring on the image page, and also upload the undoctored version and link it from the edited image as "original version".
Exactly. Which is what we have {{RetouchedPicture}} for!