We'd love to see a picture of Benoit's mother for context because looking at this, we can't see how he could have received any genetic material from her at all. He's a dead ringer for his father, Claude, right down to the shape of his ears.
You can even see suggestions that Benoit's hairline is beginning to shape itself in the same way his father's had. This portrait is almost a reference guide that allows Benoit to see exactly what he's going to look like when he gets older.