I agree with what's already been posted, especially by paigexox and EllieP. I would add at to me what separates good from great is paying attention.
How am I responding to you? Am I still, relaxed, and totally silent? If so, I'm bored, and you should try something else.
Am I pulling away? Counterintuitively, you should DEFINITELY keep doing what you're doing, and either follow me or pull me back to you, and hold me down. I scoot away when pleasure is overwhelming, but if what I really wanted was for you to stop, I'd have said so. Based on conversations with past partners, I'm far from the only woman who does this. In fact, it's your duty to drive me to scoot along the floor/mattress/sofa. If I don't scoot, you can do better.
Scooting is different from shifting. If I'm shifting, or raising my hips, or twisting into a different angle and then holding the new pose, or moving with you so that I can keep you at the angle I'm choosing, don't move with me. I'm politely, non-verbally directing your skills to the spot that needs them most. I'm acting on base instinct, and all you have to do is keep at what you were doing, but on his new spot.
Am I saying anything? Take my words seriously. If it's praise? Well done! If it's requests or directions, oblige me; don't be discouraged, just honor my requests. Requests don't mean I never liked what you were doing, only that I know what I want/need next.
Have fun. The worst thing in the world is unenthusiastic head. So lame. If you have fun, so will I, and I will be eager to return the good deed.