My crush analyses my face with a smile?

I was talking with my crush and he was listening, his body fully faced to me, smiling and eye contact strong. As I was speaking, I noticed his eyes drifting around my face analysing with a smile on his lips. What does that mean? Also, whenever I approach my crush he always seems happy to see me and his mood changes to being happier.

My crush analyses my face with a smile?
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