I haven’t thought about ASCII art text images being used for passwords in a long time. I remembered the idea when I read a post written by hackers who were trying to create software which would crack ASCII art passwords based on repeated characters.
ASCII art as a password is pretty unique still. Don’t worry too much about hackers cracking your password. Just make your ASCII art a bit more complicated, using more variety in the characters you choose and include numbers and letters too. Of course, the ASCII has to be one line.
Think of it as a good reason to work on creating new one line ASCII art.
Addendum – I found a link which generates an ASCII password, randomly. It’s not ASCII art but if you wandered into this post expecting something else, this could help.