Willink's short Wikipedia entry is here and a useful chronology on a website devoted to him is here.
Besides his Imaginary Realist paintings, Willink made a good living as a portrait artist, his portraits usually featuring the hard-edge style of his other works.
Painted before he assumed his signature style.
Wilma was his first wife. She died in 1960.
Mathilde de Doelder was another wife -- his second according to the second link above. Some sources state that he had four wives; if so, Mathilde would be the third. A while after they divorced, she was found dead, naked in bed, a gunshot wound to the left temple and a gun held in her right hand. These last two details lead some to speculate that she was murdered.
The subject is Sylvia Quiël, Willink's last wife, some 44 years younger than he. She has devoted the time since his 1983 death to her art and his memory.