Technically, ASCII and unicode are different things. ASCII has 256 characters, while Unicode has over 107k. I'm not sure which term would be more accurate for this, since this art doesn't leave the realm of ASCII, however the computer's operating system seems to go by Unicode most of the time (and Unicode includes all of the ASCII character set). I'm not exactly sure how that all works.
Anyway, the best I've seen this art used was when a JMod used this one:
............................................________
....................................,.-‘”...................``~.,
.............................,.-”...................................“-.,
.........................,/...............................................”:,
.....................,?......................................................\,
.................../...........................................................,}
................./......................................................,:`^`..}
.............../...................................................,:”........./
..............?.....__.........................................:`.........../
............./__.(.....“~-,_..............................,:`........../
.........../(_....”~,_........“~,_....................,:`........_/
..........{.._$;_......”=,_.......“-,_.......,.-~-,},.~”;/....}
...........((.....*~_.......”=-._......“;,,./`..../”............../
...,,,___.\`~,......“~.,....................`.....}............../
............(....`=-,,.......`........................(......;_,,-”
............/.`~,......`-...............................\....../\
.............\`~.*-,.....................................|,./.....\,__
,,_..........}.>-._\...................................|..............`=~-,
.....`=~-,_\_......`\,.................................\
...................`=~-,,.\,...............................\
................................`:,,...........................`\..............__
.....................................`=-,...................,%`>--==``
........................................_\..........._,-%.......`\
...................................,<`.._|_,-&``................`\