Ever wander about a location, trying to find good available light? When I first started, I made a lot of mistakes in not taking into account various factors (such as giant walls of pine), and I just found a new tool that can make finding good light even easier: a marble. Just hold a fist in front of you (like holding a telescope), tuck the marble just under your forefinger, and there you have it - the same lighting an eye would get. And since you know you want the catchlights to be up at 1 to 2 o'clock, or up high at 12 o'clock, simply turn about until you see the catchlights you want. The neat thing is that the curves and wrinkles of your hand show you the amount of contrast and backlight. Here's an example, using window light. In the first the window is back and to the left - no catchlights. But by moving back, the catchlights appear. And then I saw I wanted them higher up on the curve of the marble, and so I sat down, with the window up to my side like a softbox. A nice sweet spot, with few wrinkles. Thought I'd toss that out there to anyone using available light. Plus, I'd like to hear how you go about it yourselves.