How about the costumes, Frans final dance scene- Red is passion, she's discovered her sexuality, and Liz always wearing Yelow- Yellow is a colour of weakness, but also consider that gold is a colour of trophies, of winning. The Fact that Scott is wearing the outfit of the toreadore in the final sequence and that in perhaps, perhaps, he is dressed in a classicaly simple white shirt and black pants,.
Also, the makeup, as a mask, concentrating on how this life of ballroom dance is fake and theatrical. Fran's lack of makeup when she is first introduced and through to the ending is something you could comment on. Hope this helped...