Here is a Fantasy Portrait of Sir Isaac Newton, based specially on Godfrey Kneller paintings. He was the leading portrait painter in England during the late 17th and beginning of 18th century.
You can search more about him on Wikipedia. I think he made the best “Newtonian” portraits.
In this one I mixed the features he had painted with my own vision of this great personality, Sir Isaac. I tried to convey him in a slightly melancholic mood; you know, this melancholy that is pertinent to the geniuses/brilliant minds.
It was painted in Painter 12, with soft airbrush. The texturing on his jacket was given with a sponge… yeah, as simple as this!