For ADIM Conference 2015, I present a method to simulate aged paintings in the style of the Dutch Masters in the middle to high Renaissance. The focus of this technique is really in developing both the tone and texture, so I spent several months learning about how the materials age and the use of chiaroscuro in these early works.
Photo and costume credit for Shakespeare portraits goes to Robert Lamarche (https://www.facebook.com/robert.lamarche) (yes - he made the outfits!). Female portraits are courtesy of Fotolia stock.
Detail crops are at 100% and 200%
The Age of Fine Painting - Simulating Renaissance Textures in Adobe Photoshop (ADIM 15 Workshop)