Do is to act as be is to live/work
Portraits are being compared to a beautiful, elegant sunset.
The speaker is saying that a portrait is much more fine and beautiful than other faces one sees throughout the day, and a typical evening's sunset is, similarly, not as beautiful as a shiny, smooth-looking sunshine.
I believe the answer you are looking for is D. Personification, because to be conceived is a human characteristic
a symbol of a red Cross on the bag
