What do you mean you don't see faces? When you look at the people in your dreams, are their faces blurry or are they always turned away from you or is it something else? Could it just be that you don't remember their faces when you wake up, or is it something obvious in the dream - like when you went to speak to someone in the dream they blatantly turned their back to you or when you looked at someone's face it was a big blur or a blank oval?

In waking life do you pay a lot of attention to people's faces and what they look like? Are you good at putting names with faces? Maybe you just don't put that much importance on people's faces in waking life so they aren't that important in your dream.

It's possible that you haven't been remembering your dreams because you have other things on your mind so the memories of the dreams get pushed aside. If you have other things on your mind as soon as you wake up you're probably not going to remember your dreams.