What does it mean when someone says you look "smart"?

So I get this a lot. I will be in a class competition with someone or something along those lines and they will so "crap she look's smart." or say "oh crap you look smart". Like I don't think I "look smart". It's not like my clothes are nerdy or anything either. Check out my picture do you think I look "smart"? And for you what does it mean to look smart? Do you think they are in a way calling me ugly or dull looking. Because the last recent person to do it is now my friend.

What does it mean when someone says you look "smart"?
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