Very cool! The GameBoy camera is an interesting piece of hardware. If you're serious about finding the origin of these photos, you might want to spread it around some Japanese forums - the UI of the first few pictures is in Japanese (ニンテンドー is Nintendo and ポケットカメラ is Pocket Camera). Plus, the V hand sign you mention is a common hand sign in Japan. Good luck!
It also only has 4 colors - white, black, light gray and dark gray. This is a limitation of the gameboy display, although the photos look like they are dithered. It would be interesting to know what kind of quality the actual camera sensor has.
A strange coincidence that I was actually just reading about the CMOS sensor in the camera yesterday. You can see yourself the quality of the sensor here:
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[ 0.20 ms ] story [ 25.1 ms ] threadhttp://sophiateam.undrgnd.free.fr/microcontroller/camera/
https://www.youtube.com/watch?v=43FfJvd-YP4
For anyone else interested, I found a pinout of the link cable here: http://www.hardwarebook.info/Game_Boy_Link