Can a still photograph of a suspected sasquatch be considered good evidence? Can such a picture lend itself to validating the existence of such a creature?

Many times when a photo is posted here, Photoshop is cited as being used to generate the picture. Now I speak as someone that does not own the program or has ever used it, so I do not completely know its capabilities.

So, if someone produced a clear-as-day photograph of a sasquatch, or any other such creature, with outstanding details, would it stand up to an examination? How can it be proven to be authentic or false?

Thanks

Alton Higgins wrote up a great article in the BIP pertaining to photographic evidence, you should check it out if you haven't already.

http://www.bigfootproject.org/articles/eval_sas_photos.html