xavierdoc...
...I've heard some people saying drawings are preferable to photographs in that a photograph shows a particular specimen wheras drawings can be made to include all the necessary detail for an ID.
Not that photos can't help, I'm sure they can.
I suppose the key is to use a couple of guides and - if you're intending to eat what you find - get yourself taught by someone who knows what they are doing.
I have books with both, though I much prefer the photographs. I suppose it depends on personal preference and quality of work. Roger Phillips photographs are taken to show the salient features. Specimens are photographed
in toto from many angles with proper lighting, rather than a snapshot of the fungus half-hidden in its natural habitat with available light.
As the appearance of fungi can change with different ambient lighting, moisture, age/maturity, damage etc, I find I can extrapolate more easily from a photo than a drawing.
I suspect a good drawing is better than a bad photograph, though.