Can anyone tell whether this is a 13-inch or 15-inch?

[N0na]

The woman in these photos is actress Sarah Michelle Gellar.

 

[robvas]

That's the 13" model

 

[Phil A.]

I'd say 13" - the 15" has wider spacing around the keyboard with speaker grilles - here's a side by side from Anandtech

 

[andreyush]

The speakers design says it all.