I photograph all the time, building a digital file; roughly a terabyte drive. I have an old fashioned Morgue file in 4 filing cabinet drawers on every subject under the sun. I keep saying I'm going to scan them in, but it's a daunting task... i need an intern. I also do the Google search on keywords and see what turns up, but I rarely snag anything that's not mine. I will study it, but then draw without looking at it.