Great comments have already been suggested.
Especially on the silly sunglasses schtick.
Be a vocalist/entertainer without relying on a glam image.
IMO....
Know your material.
Don't sing to the ceiling or the walls.....or to yourself with your eyes closed as if in deep emotion. :)
Continue making brief, convincing eye contact with your audience throughout the show.
That's my take on it and good luck....