For more on Andrew Myers' amazing portraiture using screws, check this out - where you can also see how this portrait appears when viewed not at an angle. Money quote:
Meet Andrew Myers, one of the most patient modern-day sculptors around. This Laguna Beach, California-based artist goes through a multi-step process to create incredible works of art you almost have to see (or touch) to believe. He starts with a base, plywood panel, and then places pages of a phone book on top. (Cool fact: He'll use pages from his subjects' local area.) He then draws out a face and pre-drills 8,000 to 10,000 holes, by hand. As he drills in the screws, Myers doesn't rely on any computer software to guide him, he figures it out as he goes along. "For me, I consider this a traditional sculpture and all my screws are at different depths," he says.