Where did Ayu's performing style change?

[Chibi_Venus]

Please read before posting, please!

This thread was inspired by two things. First was the "Where did her style of music really change?" thread by sugarbasil.

The other was inspired by two performances of "appears," one at A museum and one at ASIA TOUR 2007.

While Ayu sticks to a theme in costumes, choreography, and set design for A museum, I feel like she wasn't... I don't know what the words are. While music was playing and while she wasn't singing, she would wave to the audience like a typical diva.

However, when watching ASIA TOUR 2007, her performance is certainly different from that of A museum's performance. Not only is she involved in the dancing (and singing), she's definitely "performing" in this one rather than singing her songs and smiling to the audience. Do you know what I mean?

So now here's the question: Where has her style in performing changed? Not only in costumes and stage designs and such, but even in her personality? Do you think she's become more serious in what she does?

I'm not sure where she's changed, but I think she's definitely become more serious in her performances in around... mm, 2005?