It's always a good start when you get more oral and less wanking, some ladies tend to just put the top of your penis in their mouth and wank the rest.
Straight up and down is good but up and down in a spiral motion is a lot better, for me the deeper the better but that ain't always going to happen
I don't like excessive spitting on my dick or letting Silvia droop from penis to mouth as you see in some porn, I find that very off putting.
Most importantly is keep the teeth away but with a small mouth or a big dick that isn't always going to be possible, I have the scars to prove it