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100 Helpful Photography Tutorials for Beginners and Professionals
101 Photoshop tips you have to know
A Beginner's Guide to Using Double Exposure in Photoshop - DIY Photography
Double Exposure Tutorial I didn't like the background cutting process so I wouldn't recommend it, other than that the tutorial is pretty good & simple !
Photo Inspiration: 20+ of the best double exposure portraits i've ever seen - Blog of Francesco Mugnai
Double exposure portraits: a simple tutorial for making surrealist images