Appearently, according to discussion on a Chinese image board, there is a even higher resolution version of this image floating about some where... I'll try to find it and upload that when I do get my hands on it.
they are just called machines eruru. also, the neck is longer than a normal guitar, and the tunning pegs are wider to allow for more leverage against tle larger strings.
I don't know of a way to search for number of favorites, but you can see the top scoring images by searching 'order:score'. The 'Marisa stole the precious thing' iosys flash (post #82943) is at the top there. I'm not sure if number of favorites has remained consistent over the years to make it a good metric for old posts.