I like this.
"Backstage" is probably an attempt to recreate this shot, but it doesn't work. This one does. Why?
1. A young child is more fragile and vulnerable than a young adult. This itself is appealing. The fact that the young child is all made up implies a certain loss of innocence. The young adult all made up simply looks (excuse the expression, I know you'll understand) sluttish. A world of difference between the two.
2. The expressions are totally different. This vulnerable young child, even with her loss of innocence, has a certain defiant look, with the chin uplifted and gazing straight into the camera. This is very arresting. The pictures in "Backstage" are pretty expressionless, or trying to portray expressions too subtle for me. Mostly the model looks bored (yes, I realize this may be what is trying to be portrayed, but it's not an INTERESTING expression - who enjoys looking at bored people?).
3. Technically, the softness and movement blur in "Yang" works very well, creating a certain melancholic dreaminess, together with the fact that the colours look slightly desaturated. The harshness and sharpness and bright skin colours (let me guess, you were using a Sony digicam?) of "Backstage" simply reflects reality all too well. Most of us like to escape from reality.
4. It does not look like flash was used for "Yang". The harshness of the sharp-edged flash shadow in "Backstage" works against it. Very distracting.
In the end, it's the expression. Does not matter about movement blur, softness, top of head cut off.