If a guys face lights up when he notices you, what does that mean?

I mean like the whole raised eyebrows, big eyes, smile etc thing

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So he seems happy to see me whenever i come up to him. He does come over to me but doesn't start the conversation really. When i do he seems to light up. And when we talk and get to know eachother and learn that we have stuff in common he seems to relax. He told before that he shy with girls and Ian brave enough to ask for a girls number and that he prefers Tinder in that way. Also when we talk i try to ask him like what Movies he likes or something and he doesn't ask me the same. Thoughts?
If a guys face lights up when he notices you, what does that mean?
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