Masters of German painting include:

The image lists several artists, and without a correct answer indicated, it is impossible to determine which are considered masters of German painting from the provided text. The options are:

• Albrecht Dürer
• Hans Holbein the Younger
• Anton Raphael Mengs
• all of the above

To provide a definitive answer, external knowledge about these artists' nationalities and contributions to German art would be necessary.