:Illustrator Florian Nicolle (previously) has published a wonderful collection of his textured illustrations from Layering scans of newspaper, ink, paint, and a fair amount of digital retouching he arrives at these truly remarkable portraits.
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Good reference/inspiration for how facial elements can be 'pushed' in abstract ways to give me interest and differentiation to characters. Could be excellent for this project and even gives ideas to cross over into animal faces.