She's looked less attractive ever since she changed her hair from these 2 styles
She doesn't look right, maybe she doesn't have that many extensions in, but her hair is too flat lately.
That's probably part of it. She just seems to be holding her face (And in the last pic, her entire head ) in some... rather unflattering positions. The dress is cute, though.
She's clearly absolutely knackered from the sresses of the tour (she's not a natural stage performer even though her performances on this tour have been amazing and she does seem to be taking to it much better). Everyone looks their worst when physically (and emotionally) shattered (although she still looks better than maybe 99.99999% of the World's population )