I wouldn't really say 'average' - when I look at the small photograph featured on Leontine's ET profile page, I derive a sense of a woman of some charm and vitality. Although, as you say, it is difficult to tell for sure. Randy Bryan Bigham, who still occasionally posts here, revealed that he once stumbled across a formal 'studio' portrait of Aubart in one of the stage magazines of the period - but he neglected to take the reference. Maybe it will turn up again some day. I certainly hope so.
As you'll see from my earlier contributions to this thread, Leontine Aubart is a passenger who particularly fascinates me: not only because of her nationality (French, as opposed to English, Canadian or American) but because of the...interesting...life-style choice she made, which accounted for her presence aboard the Titanic in the first place. Physically, she is usually described as blonde and very petite - not dark, as she appeared in James Cameron's film (besides which, every other woman at the table would have been personally affronted, had Guggenheim even attempted to introduce his mistress to them!) There is some suggestion that Leontine married rather well in later life - on another thread, a board member (I can't recall who) stated that he had seen a photograph of an elderly Aubart, taken at a family wedding, years after the events of April, 1912. But hard biographical information is very scanty and I would always like to find out more about her.