I haven’t been able to garner too much in the way of provenance on this image, except that it appears to be part of a painting that once graced the cover of novel written by the prolific German horror author Jürgen Grasmück (1940-2007) who wrote under a variety of pen names. This cover was apparently part of a series he wrote called Macabros under the pen name (one of many he used) Dan Shocker. The image is reblogged from this 30 May 2016 post at Infernal Wonders.