Can someone me in - art and the creative impulse ? ?

the purpose of the lady of shallot, a painting by waterhouse, was to illustrate a/an
a. christian parable.
b. greek poem.
c. arthurian legend.
d. roman myth.

i came across this and i found it funny that when you're bored you play hangman on so im going to guess a : )

name the above painting and its artist. how has the artist used balance, variety, and movement in this piece to emphasize the man waving the cloth, in the upper right-hand corner? be specific in your response.