It's important to keep in mind that once you install the app on your device, you won't see the icon anywhere. To access its features, you'll have to go to the options for your lock screen. There, you have to make sure that the app is set as default. Also, you can turn on the option for the app to throw in some of your personal photos from time to time. For example, you can set it so that each day MIUI Daily Wallpaper uses one photo from your gallery to decorate your screen.
MIUI Daily Wallpaper is an interesting app if you want to be surprised every time you unlock your phone. Thanks to the descriptive texts that accompany each image, you can also learn about geography, history, and tons of other interesting topics.