Yeah, like the other guy said, Tim Buckley's newest character Abby in "Ctrl-Alt-Del" is a complete ripoff of your design.
Your picture is a 1st page result in Google Image Search for "punk girl". [link]
Tim Buckley is notorious for stealing images off Google Image Search and using them as backgrounds. Now he appears to be using it to steal characters as well.
It should also be noted that although Ctrl-Alt-Del is a webcomic, older story arcs have been officially published in book form for profit by Blind Ferret. The newer story arcs (including the one featuring Abby, a central character) will surely follow sometime in the future.