Faily tutorial: how to draw noses and eyes

Apparently, posting my drawings here gave toodelicious the idea that I am able to hold a pencil the right way and she thought I could help her with realistic drawing of noses and eyes.
I aswered with:

mhm... noses and eyes are the hardest to draw.
It all depends on shape and shading. The trickiest part is getting the proportions right, and then replicating the shape.
To draw a nose it's important to remember that it's rarely outlined with marked lines (unless you're drawing a face seen from the side): you may stress the contours of the nostrils, but the bridge is usually drawn with soft shading. My advice is to start with a faint outline of the entire face, then work on the parts where the shadows are deeper and go on from there. Sometimes leaving the outline as part of the drawing is good, too, especially for the parts hit by the light: this way you can still see the shapes, but without making the drawing too "heavy".
The secret to draw realistic eyes is all in portraying their expressiveness, which is achieved by solid shading and a high highlight contrast. It's also important to remeber that eyes are wet, which means you'll have to draw their shinyness, too (this can be very very tricky so bear with it).
Looking up some reference picture might help you to individuate the lines you'll have to stress and the ones that will be "invisible".
Does this help? I hope it's not too incoherent. Explaining these things in English is not easy :(

Of course, that didn't make much sense. So she asked me if I could show her how to do it.
Therefore, I give you ( a faily tutorial )

Any questions?

ETA: if you want to see some good (and by good I mean mindblowingly amazing) realistic drawings, go here and check out samelastdream's portrait of Ryan Ross.

ETA2: Just found This tutorial on DA. Very useful and way better than mine :)