From what i see about the picture it looks like a calm Cafe, where people are relaxing. The texture of the work is also very good, I like how the room looks balanced from putting people and tables on each side.
Not great with math sorry
My day was good.
Have a good one
The mnemonic for space notes in the treble clef is FACE (like the one on your head.) The bottommost space is F, the second one is A, and so on.
Reading the notes like so, we get A, then C, then E.
ACE would be your answer.