I am always intrigued by the arguments and panel discussions that get rather heated about using photographs. For me, I love photographs because I can flip them upside down, sideways or any number of ways to right brain paint but that is the only benefit I get - I hate the printers and the screens and the cameras and so many other variables that mess with simple colors and values that are plain as day in life situations. I never once wonder what color that is, what value that is, what is that shadow doing when painting from life like I do with photographs. Heck, I even hate my photographs of my paintings lately.
I found this blog interesting. More than anything - his still life set up fascinates me! I had to blow it up many times to figure out how he did that with the frames and grid. http://www.learning-to-see.co.uk/why-i-dont-paint-from-photographs