This image was acquired from
flickr. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
public domain elusive muse collage fodder drawing reference monochrome blackandwhite sketch text writing illustration indoor cartoon white background black and white Public Domain Book Petrefactenkunde Deutschlands by Quenstedt Fr. Aug. von Friedrich August Published archive.org Public Domain Book Petrefactenkunde Deutschlands