Greiner's untimely death at age 46 left a lot of people in the art world wondering if he'd reached his full potential.  Very meticulous, he would often do multiple studies of various sections before committing to a particular version of a major work.  This is one of four different studies I have found of the same character in a large painting of Ulysses being tied to the mast so he could hear the sirens.  And this was just the guy who tied Ulysses up.  Click to label to see the finished version.