Firstly, how has your sleep been? Have you taken any recreational drugs? Those are common reasons of perceptual disturbances - at least for me.
Does seeing the faces and shadows interfere with your ability to function? Do you find them bothersome?
If the answer is yes to both questions, and you have been getting 7+ hours of sleep nightly for the last several weeks with minimal drug use, I'd suggest talking to your GP about this. They will likely prescribe you an antipsychotic, if I had to guess. But who knows, they may surprise you with something that will actually help and not ruin your quality of life. Keep us updated.