Most ASCII artists will tag their ASCII creation with their initials. This is not just about signing your art, it shows who created the art – the original artist. If someone else colours the art, or modifies it in any other way, the artist initials need to be kept with it. Anyone modifying art can add their initials and a note about what they had done to the original art. Include a link to where you found the art, if not a link to the original artist themselves.
This is what the Respect ASCII Artist’s Campaign is about. The ASCII art is available to be enjoyed, used and shared. But, give respect to the original artist and leave their initials on the work.