Lucas Cranach's Portraits of Martin Luther and His Parents

The other day, I was researching something about Martin Luther for some reason and came upon three portraits by Lucas Cranach the Elder (one of Luther's good friends and an artist). I've never been one for Cranach's nudes, but his portraits, such as these, are very telling and insightful into the characters of the sitters.

Portrait of Luther's Father, 1527

Margarethe Luther, year unknown


Martin Luther, 1529

After reading the information on the following links, what do you think of Cranach's portraits?

The Internet Encyclopedia of Philosophy's entry on Luther
The Catholic Encyclopedia's entry on Luther
10 Things You Didn't Know About Martin Luther from a PBS program