I need help writing an Ekphrastic poem about Mona Lisa

How does the reputation of the author convey authority? from ''city upon a hill''

Today’s readers have more scientific knowledge than readers of previous eras what effect does that have on their reading of science fiction stories

Which sentence is punctuated correctly? the shoes normally cost 40 dollars, however; we got them on sale. the shoes normally cost 40 dollars however we got them on sale. the shoes normally cost 40 dollars, however, we got them on sale. the shoes normally cost 40 dollars; however, we got them on sale.