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.
Answer: That Panel's take a picture from space every month or day
Explanation:
Answer: i'm not sure about the artist and painting names (just reverse image search it by going to images.google.com) but yes, the artist has used space effectively, by filling the artwork with details and color to highlight the people in the middle.
Explanation:
Top left: B A G
top right: C A G E D
bottom left: B E A D
bottom right: E G G