Tell me if I understood it right what you mean = Yu Na is better at "interpretation", because she has great face language, energetic movements, great footwork. A great temperament on ice.
Yes, exactly.
OTH Zhang has the soft balletic movements. So she is better at "artistry"... I didn't like her interpretation of her SP nor of her LP. It seemed that she didn't even like the music, it seemed it was forced, without feelings, without personality.
Not just "soft" movements, but smooth and flowing, as though no ounce of energy is wasted. The best ballet dancers, after years of intense training, can sometimes achieve this effect: making their movements efficient and smooth, so as to minimize jerkiness and energy expenditure. Ever wondered how some ballet dancers manage to perform onstage for an hour at a time without apparent fatigue? Ever noticed how Caroline, despite her tiny frame, gets through an LP without a single mistake, and still looks like she could do it all over again? She's naturally gifted in this respect.
The greatest ballerinas, of course, can express strong feelings, as well as making their movements look polished, smooth, beautiful. Partly Caroline will benefit from more dramatic music -- neither her SP nor LP music was anywhere close to the drama of Yu-na's SP last year. Partly I think she needs to find out how to express her emotions, or the emotions of a character that she'd like to portray, through her skating.
I've heard that Caroline actually really likes to skate to soft, balletic music. Maybe thus far she's only wanted to portray a sweet princess on ice, which you can't blame coming from a 13-year-old. Her coach said in interviews that they do plan to explore more varied music in the future, in particular away from only soft, sweet music.