I want to create an image that will be composed of lots of layer masks that I am going to use to paint different effects back over someone's face. I currently have a hue/saturation adjustment layer that I used to desaturate the image and then I selectively painted that desaturated layer back over the skin of someone, I also want to add some green so I created a color balance layer and made a layer mask out of it and want to selectively paint back some green to the skin tone.
1. Does it matter in the layer stacking order where these adjustment layers/layer masks reside?
2. Any general tips for working with an image with lots of adjustment layers/layer masks?
Depending upon the blend mode, it does matter what order you put the layers, as the topmost layer will affect what's below it. You can play around with the different postions and see what works best for your image. You can also group the layers, and set the blend mode of the group to anything other than "Pass Through", so that the adjustment layers only affect what's in the group.