How can I detect if a photograph has been faked?

You can check the lighting sources, zoom in and check for differences in resolution between the different parts of the image and try enhancing the edges.

Expert advice around these parts also recommends the free Adapative Equalization plugin for bringing out hidden details:

www.reindeergraphics.com/free.shtml#adapteq

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Relevant discussion:

Photoshop detectives: The composite creature from North Carolina

Photoshop detectives 2: The 'Dover Demon' from Chile

Is this image doctored?

Faked CCTV footage of London bombers?

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Emperor

(Created by Emperor on 09-20-2005 17:18)
(Edited by Emperor on 09-20-2005 20:55)