I needed do to some active research this morning for my current dummy. Because I want to represent leaves, ferns, berries and pond water I took a long walk with my camera and gathered a lot of good info. We have SUN today, so the time was just right in the early morning. Dew is still on the leaves, the grass is wet and the forest is fairly still.
To make the photos work for me I put them all into a separate folder within the current project file and make a little thumbnail photo like this one, so I can easily find what I am looking for.
My work is semi realistic in a painterly style, so these just serve as a reference. My paintings will be accurate, but not photo realistic. I am not sure how a PC handles this kind of file, but I like having the Mac that can show me at a glance where things are and which file I need for a reference as I draw or paint.