What emoticons/emoji are flirting? Are there any that are too obvious? I don't know if it matters either. It seems like my case is pretty sure?

Anonymous
Earlier I sent my female friend/crush a smile face with a big smile in my response to her happy face. But what faces are flirting? I know a winky face is which I haven't used. For example, right now I feel like sending her a heart eyes face in a Facebook message. Big or small.
What emoticons/emoji are flirting? Are there any that are too obvious? I don't know if it matters either. It seems like my case is pretty sure?
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