First of all, the expression on Tera's face is perfect, which is one of the most important factors in what makes a good facial. Secondly, what she says and how she says it: "ooh, I'm ready, I'm ready... [licks lips]... I'm ready." Superb. The way she licks her lips just makes it even better.
One quibble might be that the load itself could be placed a little better - it sorta glances off her forehead.