I ask all these questions, so I wanted to give back a little. With my limited pua skills self.
Since we want to come off as unique in her eyes, and spontaneous... And since texting is an element of the rapport building process, try this. Instead of text faces

:/

(^-^) (*・・*) (⊙_⊙) (=☆_☆=) \(◎o◎)/
use picks of real things. Google images will give you funny photos of kids sticking their tounges out, angry babies, confused faces, various anamal faces. You can also find photos that embody the meaning. I texted this girl "let's make a deal" and attached a pic of two cartoon business men handing a stack of cash to each other behind their backs. Once I said, "can't talk, in a hurry." And attached a pic of a guy flying with a rocket jet pack.