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I enjoy creating collages that reflect my mood and have a unifying psychological theme (and I also use my own photos)... there are many such works online, as you showed, but these are not taken to heart by enthusiasts... it's better to look at the collages of Bereniki or El Magnus
http://www.almagnus.com/index.htm... I work more in this direction... and if you want to improve your technique, I highly recommend buying Martin Evening's reference book - it describes all the effects and many techniques... no courses can provide this... I've also been buying the magazine "Photo MASTERSKAYA" for a couple of years... it comes with a disc - programs, video tutorials, brushes, and other Photoshop extras... the contests there are good... I like these works by El Magnus (the last work by Vereniki)... they make your blood run cold and you want to indulge in some dreams... (I removed the photos - I'm out of meters... they are all available at the link).