Hi Celeste,
I believe that the portrait that Tim posted is "The Laughing Cavalier" by Frans Hals, 1624. But I have to admit that the cavalier does bear an uncanny resemblance to Tim, given a little change in styling of facial hair. Also Tim does, on the whole, tend to dress a little better than the cavalier. Still, it's not too surprising that you might mistake this one for a self-portrait!
I'm a little confused too at what you're getting at. In the Monet, the sun appears to be entirely produced by color contrast, with no value contrast whatsoever.
John