My new conure keeps biting my face and ear (new bird owner)

[Emburdeyu]

I just got my 2 year old male GCC, Biscuit, a few days ago. He likes to sit on my shoulder and lets me pet him and steps up without biting me, however when on my shoulder while he preens my face he sometimes bites my cheek or lip hard or my ear. I tell him NO firmly then put him back on his perch for a few minutes while giving my back to him then picking him up again rinse and repeat if he bites again. Do they grow out of this and how long does it take for him to learn not to bite