Which convention does German Renaissance artist Matthias Grünewald use in the Isenheim altarpiece? The altarpiece incorporates the medieval belief that art should communicate a religious idea.

The artist followed the Italian Renaissance convention of using one-point perspective to create a sense of depth.

The altarpiece incorporates the Italian Renaissance ideal that art should communicate intellectual ideas.

The figures on the altarpiece have idealized proportion and facial expressions.

Aa i believe is the answer to your question

These traits are all equally important in recognizing the validity of artwork mainly due to an artists' consistent style and reputation which they have developed over a lengthy period of time. most famous paintings contain specific characteristics of the artist who created it. an appraiser would pay close attention to certain key elements within the painting, as well as an accuracy in measurement and color shade. blended textures and outlines are essential in recognizing an authentic piece from a copy. signature and imagery exist in epic proportions to balance out each trait as they coexist in harmony, depending on preference and style of each artist. no two original pieces are virtually identical, although it may be almost impossible to see discrepancy with the naked eye.