For my design work, I sometimes create portraits to illustrate campaigns and other media. In an effort to avoid mis-appropriating someone's likeness, I tend to draw from a collection of unrelated found portraits and previous life-drawings to construct a "unique" portrait. I've always been anxious about accidentally appropriating the likeness of someone without realizing it. I'm currently living in Ireland. I'm aware that in the field of photography, any persons featured in a photo to be used commercially must sign a model release form in accordance with Copyright and Related Rights Act (Ireland), 2000 and Data Protection Act (Ireland), 1988.
If I can prove that my drawing/illustration was "constructed" from a mishmash of various image references, surely I'm not a criminal? :P
P.S. I haven't posted on the Law stack before so apologies if I haven't provided enough background!