Drawing from life is wonderful because you get to fully experience your subject. Compare the difference between drawing from a photograph of a person and drawing that person in real life. If you draw from direct observation, you would get to talk to the person, hear their voice, and learn about their personality.
I'm pretty sure it is B a minor interval, because a note is lowered, it is a minor. Sorry for the wait, had to do some digging in my memory. Good luck!
