EDIT: Okay, so I came across this tshirt for sale at RedBubble. The two designs are extremely similar. The moment I saw it, I thought that this Tom Trager had ripped off my design and made a shirt from it.
After looking at it closely, though, I'm confident that the similarities are truly just pure coincidence. The illustrations are clearly different. It's just that the subjects are the same, and any fan of the show who decided to create something about the many looks Tobias Funke would have chosen those same looks too. So I'm only writing this to, I hope, protect myself from accusations of plagiarism. So buy the shirt. It's pretty cool.