Follow her reactions, use your imagination and watch her eyes. Those are the three most important things I've discovered.

IRL I've had a few women say the same thing, "Where did you learn that" and I would just ask if they enjoyed it. Answering it would have been detrimental.

"The Eyes Have It"

Hello Eva, I hope your birthday has been sexy and wonderful today!!
You posed your thoughts to both the "Ladies and Gents",
I'll be the second woman to join in.  
I concur with all of you that our eyes truly emote the delights that  
our bodies are experiencing.  Second to ones' verbal cues.  I tend to be  
very verbal during an encounter, especially if I am really vibing with the person.
It's such a "turn-on" to me to hear that I'm giving you pleasure.
If something feels amazing, I can't help but tell you!  If you walk in the door
and your fragrance is intoxicating, I will ask "what are you wearing?".
If you're bringing me to the brink of ecstasy, trust me you'll know!
Some people prefer to be completely silent.  I say, "to each his/or her own."
But imo, if you are not verbally communicating to me at all, then the "whimace",
on your face while I'm gazing into your "eyes"  
may be misconstrued as pain, when in reality, you're in the throes
of well,  "Eva Bliss"...tell me, I want to know. ;