Shading a piece of graphic art

In this exercise we're going to use the Mixer Brush in order to shade an…actual piece of artwork.…And that actual piece of art, such as it is,…is this guy right here, it's called Robot in color.psd. And notice right at the…top of the stack is that enhanced piece of robot art, which is now called the line art layer.…What I want to do however, because we've got so many Fill layers going on.…I want to give you a sense of how this layered piece of artwork is built up…because you will need to know that in order to shape things along with me.…So I am going to Alt+Click the eyeball associated with the lowest layer in…the stack, that's the Texture layer of course, that would be Option+Clicking on…the eyeball on the Mac.…

And then I'll turn on this Adjustment layer that lightens up the texture as well.…Now in front of that we've got a group that's called Backdrop and it contains…several different items, all of which are masked inside of the background.…So the robot is masked out of the picture and I'll go ahead and turn on that group.…