Here is the Rembrandt Self Portrait (detail below) I referred to in my discussion about Herman Doomer, with Jean Ingres. You can follow that discussion here. This self-portrait was painted about 20 years later than Herman Doomer. Look at the edges on the right shoulder and the beret. Compare those to those same areas in the Herman Doomer portrait. Do you see more similarities or differences. What stands out to you? Here’s a closeup of the face to aid in your comparison.