The real coordinates are:
N46.01.ABC W064.52.DEF
A= the number of letters in the last name of the artist
B= the number of letters in the name of the painting
C= the last number in the year in which the painting was created
minus two
D= the number of letters in the name of the artist's country of
birth
E= the number of letters in the first name of the artist
F= the number of the month in which the artist died
North checksum is 25, West checksum is 31
You can check your answers for this puzzle on
Geochecker.com.