Is this a good or bad emoji?

[Messi10]

It's the face where it's smiling and it has red cheeks and the eyes are pointing upwards. Also if a girl uses this emotion is it good or bad. I am just wondering because I message this girl on Facebook after I said she was stunningly beautiful and I just said hi and then she said hey with the face and then I messaged her again and she replied with the same face after the next message I sent. Also what does :a mean?

[marcus]

It's like when u checking out and smile at a random pretty girl in the train station, and she smiles back at ya.

It could only mean two things.

She thinks you're cute.

Or She thinks you're looking like a moron.