The artist isn’t unknow. His name is Jarsolav Panuska, a Czechian artist that died back in the 50s. This painting is called Death Looking Into the Window of One Dying and was painted either in the year 1900 or thereabouts.
Took three seconds to find this information and it bugs the hell out of me that the original poster couldn’t be arsed to go look this up before posting and tagging it with ‘artist unknown’.
“artist unknown” means I do not know who the artist is and do not want to take credit for their work.