Mindset. You can get the sexiest haircut, the latest fashion, and etc, but if your mindset isn't straight then you'll project a vibe that does not fit your physical image. Girls will pick up on it and feel like something is off with you.
Try to obtain the abundance mentality, "the devil may care" attitude, and try not to view pickup as a complex procedure. If you're walking around running Chase's latest article through your head, thinking "I'm gonna make C approaches and get K numbers in J hours", or mentally rehearsing scripts about what line you're gonna open with and the next 5 questions to ask her, then more likely than not you'll give off a tense/serious vibe. Rather, view approaching as something casual that you do when you happen to run into a beautiful woman while you're out and about minding your own business. Be chill, happy, and sexy.
Hopefully that helped. Good luck and take care