Villa paintings

The Villa paintings are a series of paintings located in the map villa, some paintings are connected to the ARG.

One of the painting seems to have red markings around the lower half of the painting that cannot easily be seen.

• It's a number 4 and a 3-letter word with the second letter crossed out. Looks like 4 MAN?
  • this could refer to 4 dead men: Jeff Walter, Mikhail Rosenthal, Xeander Berg and Eric Kleinman This theory can be further reinforced just by looking at the characters forehead with an "X" on it and the wings on the characters back, which could imply death.
• It could mean FOR(4) NO(Cross) MAN(Word Man)
• The wings of the machine at city gates, and four beings that are not men.

Clues

this image is is Portrait of Johann Dietrich Heumann, by Anton Raphael Mengs.
Markings only, credit to Flaraor ljos:

This painting has no visible markings, but one of the faces resembles Morko's mask. The wings given to the Dentist are reminiscent of the wings given to the machine seen in city gates. The painting is an edit done to Johann Liss's cover of Lucas van Leyden's copper engraving titled "Bauer beim Zahnarzt" or "Farmer at the Dentist" in English. The painting originally depicted a farmer having his tooth removed by a dentist, supposedly his wife by his side. The right is the original.