They're all in the public domain due to age since the death of the creator. You can do whatever you like with works in the public domain (yay!). See the sectio

They're all in the public domain due to age since the death of the creator. You can do whatever you like with works in the public domain (yay!). See the section at the bottom of https://commons.m.wikimedia.org/wiki/File:Van_Gogh_-_Starry_Night_-_Google_Art_Project.jpg https://commons.m.wikimedia.org/wiki/File:Van_Gogh_-_Starry_... for an example.