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Personally if you photoshop an image that no one has seen... and your skillful enough to  edit, add and remove objects, or add more images to it, change it from day to night , summer to winter, so on and so on , then the average person looking at the image would most likely not notice. BUT if you not skilful enough then it will show. If your image is the same as everybody else as a group task  then someone  would possibly be able to say how much they think the original image has been changed, but that again unless you're a pro with a trained eye could be hard to say to what extent its been changed if your very skillful.

The obvious factor would be changing/adding to much to the image. subtle changes can make a great deal of change, just one curves adjustment can change an image dramatically. I dare say that some one on here can shed more light on your question.