Hi Helen, I think we did a thread on this not too long ago, but I can't find it now. It was quite interesting, so hopefully you'll get some similar answers again. I like to have both around, using the artwork illustrations for basic i.d. work because they try to show the typical and/or critical distinguishing features, and then the photographs are there for checking, especially jizz, which I think may be the most often misrepresented feature in artwork.