Today I accidentally discovered a treasure website: Artvee.
This website collects classical and modern art picture resources from famous artists around the world, divided into categories such as abstract, concrete, illustrations, posters, landscapes, plants, animals, etc.
https://artvee.com
More importantly, the resource can be downloaded for free in large high-definition images, which can be used as wallpapers or screensavers on mobile phones and computers, which are quite artistic.