The third in Robin Wood’s Photoshop tutorial series of tips and techniques in creating graphic elements for use in Second Life:
3-D designer
Video Tutorial – Painting Fine Lines on a Mask
The second in Robin Wood’s video tutorial series on Photoshop tips and techniques for the benefit of Second Life 3-D designers:
Video Tutorial – Creating Selective Drop Shadows in Photoshop
Robin Wood, one of the more remarkable 3D designers I found specializing in Second Life, has started producing a series of weekly video  tutorials on tips and techniques that she shares each Tuesday. This is the first one in the series: