Update 2018-10-15: Interesting link added.
Click image for large size or read on for details.
The Franz Marc watercolour is very different from this one, it features two horses and is painted in a very different style, using two shades of blue on top of a pencil drawing.
Added: see also the top image on this page from Kazakstan (page and text in Hungarian). I may want to make a version of that one some day, but then it almost looks like I've already done so some centuries ago, in another life.