In a link from the article mentioned in my previous post on Master Artists’ Palettes, Lucy Davies pointed to a search on the Bridgeman Art Library for “self portrait palette“. This turns up range of artists’ self-portraits with their palette in hand, a fairly common arrangement given that the artist is usually holding a palette when painting a self portrait.
The linked images are on the small side, and unfortunately watermarked, but think of this as a jumping off point. The images are large enough to tell if you’re interested and the listings make it easy to do a broader search for the artist and their works, including the named self-portrait.
You can also try the same search on Google Images, though results tend to be more repetitive.
You can also search for simply “portrait palette” for a wider range of images not limited to self-portraits, and perhaps more likely to include views of the working part of the palette, often hidden by the angle in the self portraits.
(Images above: Vincent van Gogh, Giovanni Fattori, Diego Velázquez, Sir John Everett Millais, Gustav Courbet, Rembrandt van Rijn; links are to my articles, Velázquez and Courbet images are crops from much larger compositions)