Hey mate! First off, there is nothing wrong with the smile. In fact, many guys already fuck up by not smiling. ALWAYS SMILE when you game. It communicates that you're in a good mood, you're confident, and you're fun. Nothing bad with that. Being humorous is also a very attractive feuature. What you lack, is sexual energy, sexual tension. You need to be a sexual man. Girls won't really have sex with you unless you talk with them about it. At least, that's my general experience.
Just a very simple example I had with a girl I've known from the university. Thing to note I was messing with her like all the time... She drew a cute cow on the board, I drew a cloud with a lightning that killed it. Another time her hair was in front of her face and I slipped it back. Extremely naturally. No thinking... in fact it was later that I realised what I'd actually done and that after that I should move immedieately. So I invited her and here's a small part of the texts(not exact)
Me: Really the only thing that scares me are wasps. Hate the stingy bastards.
Her: Haha I think I'm gonna buzz when I arrive just to freak you out.
Me: That would be nice but to make it more exciting you could get up some wasp-like dress. That's kind of sexy too.
Her: Haha, silly.
She didn't come in a wasp-dress but I fucked her anyways. Next time we texted I called her Buzzy.

She liked it and was laughing at this for lilke days. So as you see, it's really important to get sexuality involved in the convos somehow both physically and by words. Also note how I've built a connection with this wasp thing. This too was kind of spontanious lol I really don't like planning shit. Good luck bro!