You must look in between the primary colors.
In between blue and yellow, there will be three colors but the one in the middle is the complementary (Green)
This piece make use of values. Due to the use of lights and darks on the piece, certain lines may have more emphasis than others, thus creating movement in the piece. This piece does not have a subject matter, because it seems to be more focused on formalism due to its wide use of elements and principles of design. This piece does not have content.
It depends if it's a single or a double bar line.
if it's a double bar line it's just there to separate the sections of the music and if it's a single bar line all it does it separate the beats in order to make a measure.
I am a student in a middle school.