You don't see any damned gridlines here. Mind you, his subject matter is far more inspiring. Who would have thought that Peter Falk (AKA Columbo, in The Princess Bride, Wings of Desire) could paint? But he's actually a very competent artist. See more of his work here: http://www.peterfalk.com/ArtPF.htm.
Note: As he is ill I suspect his website will be shortlived. There are no links to the artistic portion of it off the main page of the site. Enjoy it while you can.