Well, Ill say what I dont like and how you find out..
You HAVE to use your hands.
Cup, rub, keep the balls warm is a must. Licking them may be a no no (ill punch you if you lick mine...yeah, its that sensitve on me)
I like her to keep her tongue stimulating the belly of the dick, up and down the urethra.
Firm grip is not always good. A good hold (he feels all your fingers, but is not sufficating)
Jerk up the dick while you lick down the belly. Or vice versa, this is a preference.
Speed should be constant. What type of speed in another preference.
Thats about it.
A woman that lives 30 min away from me really gets into the blowjob and its kinda really good.
She can deep throat (i told her to stop though cuz my head was getting pressed again something in her throat and it hurt)
She has got some of the most slippery saliva that when she takes the dick out of her mouth, she gives a handjob and it works.
While she uses her slippery saliva to jerk my dick, all her fingers go past my dick instead of stopping at the rim of the helmet.
She also rubs my dick against her fake tit a few times and for some reason that works too.
When it comes time to cum, she sucks on the head too hard sometimes and its too sensational to enjoy. Too explosive. I dont know, but it sucks.
Anyway thats what SHE does. I couldnt tell a girl to do all that, its just not something you 'teach.'
My ex gave the best blow jobs of my life and she followed the previous instructions.