Yeah, the problem is that once you take note of the chin, you focus on the chin, forcing your mind to reconstruct everything else. Of course, it might be like clocks and letters changing--once you get used to doing checks and reconstructing the image, your mind will get better at it. But who knows? I heard of a meditation practice where you focus on the face of someone you love for as long as possible. Maybe practicing that and then trying it in a dream would give you more stable results, and although you'd have to be wary of the placebo effect of remembering their face from life and attributing it to the dream you just have, trying to in your memory place their face in the context of the dream you just had without placing it there from what you already know might reveal more about what's going on. Sigh, if only I had a machine to measure brain waves, then I could test whether the stimulation occurs in the same area of the mind when recalling visualizations from dreams or recalling visualizations from reality, same thing with a face from each, with an object from each...I wonder if research has already been done?
"Life is that which dreams are made on, and is rounded by a sleep."
-Prospero, Shakespeare's "The Tempest"
Check out my lucid dreaming blog: www.rememberawake.com