Today, I thought about lighting and how to work with reference that may be different that what you need. For instance, what if you needed a hand reference picture, but the lighting doesn't match your illustration?
Step 1: Collect Reference
|By Aurelijus Valeiša|
Step 2: Desaturate the photo. In Photoshop, go to Image-> Adjustments-> Hue/Saturation
Step 3: Move the Saturation slider to -100
Step 4: Go to Image-> Adjustments-> Invert
Final: Now you have an idea as to how the lighting works in reverse. So if you have a great photo reference, but you are frustrated by the lighting in the piece, then this can really help you reference lighting that works with your illustration.