Is a guy that's smiling a lot of the time, a turn on and turn off?

Ok so I'm a guy who's either almost always got a smile in his face, or is smirking, is this a turn on or turn off. When a girl (who I like) looks at me, i always give a huge smile, I don't know why I just do it. Can it seems a bit creepy if so? Girls is it a bit weird?
You could say my smile is a lot like this fc02.deviantart.net/.../..._vishstudio-d4q5vd8.jpg

I read somewhere that girls like guys who are serious, and moody?
Is a guy that's smiling a lot of the time, a turn on and turn off?
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