Might sound a bit silly, but did you draw the upside down face upside down, or did you rotate the image? I find it almost impossible to draw faces upside down, even simple ones... It just ends up completely disproportionate, even if I try to use guides, when I turn it the right way up.
lol, yeah, I know what you mean. Drawing upside down is like trying to draw with your left hand; no matter what your brain is saying, it just ends up looking wonky. I rotated the canvas, there's a really simple way in photoshop - just hold the "R" key and it swivels!