Please note that this is not an application. It is a Live Wallpaper and there it does not have an App Icon. Fellow the steps given below to activate the wallpaper.
Hope you enjoy the wallpaper and your feed back will be appreciated.
1. Download live wallpaper and install. (if download from Google, automatically installed)
2. Long press home screen
3. Select Wallpaper and then select Live Wallpaper
4. Select "Emma Watson live wallpaper"
5 Press Set As Wallpaper