The pearl girl

This story about 'Woman with a peal earrings'.
I know this picture because I have seen at Ootsuka International musium.
Oostuka museum is very interesting and fun i think.

This story used guard.
Guard is Guard man.
but, English book's this word don't need Guard man's 'man'.
So, i thought this is verb, so I couldn't understand smoothly.
but, i remember it!
If there are gender's teacher here, she would angry.haha