Leonardo is a free app that offers you the most beautiful pictures of Leonardo Da Vinci in 2K resolution.
You can share this pictures with dropbox, facebook, twitter, Google+, Bluetooth, Gmail, PDF, ChatON, email, Hangouts, Wi-Fi Direct.
This app can be stored on your SD card, to save space.
You can pinch to zoom on any pictures and set it as wallpaper.
This app is totally free, without any spyware or unwanted notification, and very easy to use.
There is no watermark on the pictures.