A number of years ago I used a great text called PURPOSES OF ART, by
Albert E. Elsen, Holt Reinhardt and Winston, ISBN 0-03-089708-8
It had great chapters such as Images of Authority, The Figure in
Sculpture, The Portrait in Painting and Sculpture.
I'm not sure if it is still in print but it may be worth checking
out. I used it extensively with juniors and seniors when I taught
thematic art history classes about 10 years ago in Australia.
Fine Arts Dept.
Hong Kong International School