Sexy Hot

Is there any advice I can get from females on what I cna do to look sexy? Right now, I have dark circles and a somewhat sad face. If I smile, it looks a tad fake.

I am tired of the usual advice of drink water, get some rest, be yourself. Women put makeup, lipstick, get hair removal etc... to look hot.

What can I do to look sexy when it comes to the face? Can I see a beautician to help me? Take some lessons in faking that look? After all, women are often unconfident, but fake confidence really really well!
I am trying to get either an online date (my facial pic looks to serious and very nerdy), and I also want to get better pics in general when we have parties and people ask me afterwards why I look so sad upon seeing pics.