Käthe Kollwitz (July 8, 1867-April 22, 1945) was a German artist who worked in painting, etching, lithography, woodcuts, and sculpture.
Biography on Wikipedia: https://en.wikipedia.org/wiki/K%C3%A4the_Kollwitz
Two Children at the Bannister by Käthe Kollwitz
c.1927, Charcoal on faded drawing cardboard / Käthe Kollwitz Museum, Cologne, Germany
Käthe Kollwitz on Artnet: http://www.artnet.com/artists/k%C3%A4the-kollwitz/
Further reading:
http://blogs.getty.edu/iris/kathe-kollwitz-agent-of-change/
https://www.artic.edu/articles/910/kathe-kollwitz-an-art-of-resistance
https://www.kaethe-kollwitz.berlin/en/
The Misty Miss Christy 
Reblogged this on sketchuniverse and commented:
🖤❤️💛 KÄTHE WAS A FAMOUS AND HUGE ARTIST. IN THIS BLOG YOU CAN FIND SEVERAL WORKS OF HIS. LOOK AT THE DIFFERENT THICKNESS OF THE STROKES IN THIS WORK, AS WELL AS THE DIFFERENT INTENSITY OF THE BLACK COLOR.