The f(x) girls seem to be really improving from their debut!

I think Luna has a really strong and solid voice,

which really does sound better with every performance.

I think the two better dancers in the group would be Victoria and Krystal,

even though Victoria doesn't get a big role in the song.

Sulli's voice has improved a lot since the initial performances too,

she used to sound a little breathless,

but she has great stage presence with her constant smiles.

Her expressions are always really good. :D

Amber on the other hand though,

doesn't really seem to be aware of the camera on her,

and smiles only when her part is up.

The rest seem to be good at keeping up with the expressions,

and constantly conscious of the camera on them,

but Amber doesn't smile when she's not doing her parts,

and a little often than not,

that has been caught.

Hope she'll continue working on her expressions,

but her rap is smooth as always.

I wonder if she did the variations herself,

or was instructed by their choreographer/trainer,

but she seems more comfortable on stage now.

I still keep forgetting that she's a... she sometimes.