You might see a combination of single pictures and subfolders. If you’ve already created subfolders in the Pictures folder to organize your pictures, you’ll see those subfolders too.
If you have pictures saved to your computer in the Pictures library or subfolders therein, you’ll see them when you open the Photos app. Pictures and videos you take with the camera appear in the Pictures folder, and you can view them from the Photos app. The Camera app lets you take pictures and video directly from your device (provided that your device includes a camera). The Video app lets you access your personal videos (perhaps those you’ve taken with your digital camera), other types of video media you own, and offers access to the Xbox Video store where you can rent or buy movies and TV shows. The Photos app lets you access your pictures, create folders for managing those pictures, and edit the pictures you keep. These are the Photos app, Video app, and Camera app, all available from the Start screen. Windows 8.1 comes with three apps for working with visual media.
Setting a picture on the Photos tile or lock screen