Cranach the Elder Art walls

This application contains many of the works of Lucas Cranach the Elder carefully cataloged.
The main screen provides a quick view of the categories accompanied by an explanatory image and title (if the title is not entirely visible you can touch the image of the category to make it slide). Long touch the image of the category to diplay the gallery with all the thumbnails.
Touching a thumbnail will open the enlarged work and you can navigate in current section using the gallery below.
You can perform various actions on the work currently displayed using the buttons at the bottom.
Using the buttons:
1. Back arrow: Back to previous view
2. Four arrows: Displays the current work in full screen (you can choose the external program of your choice. Example Gallery)
4. Phone Icon: Set as Background currently displayed work (will be displayed a dialog box for confirm)

Thanks