I think Socheat is correct on faces. Because the movements of the eyes and facial muscles convey so much to sighted people its held that the face is important to convey emotion, but if you can't see you just don't get that so the face is just the body part with the holes in for food and smells to go into ;D.
I admit I am a little sorry to not be able to get facial expressions as I would love to know what it is like, especially as an actor and even more especially because people tell me I have a hugely expressive face anyway, then again I probably would miss my emotional sense I'd done facial expressions instead.
There is truth in the fact that sighted people don't learn to use other senses, however equally I wouldn't underestimate the amount of information a sighted person gets from sight either, since there are indeed things I'd love to see.
As I am synaesthesic myself I actually experience colours even when not seeing them, since for me most sensations are colour mixed with tactile, including sounds, concepts, ideas, smells tastes everything! and is true whether I'm using my remaining vision or not.
I'm pretty certain that my lady experiences colour, both because she's fascinated by the idea! of colour and likes to know about it so has some matchable concepts even though she lost her sight before the age of two and so has no tangeable system for colour, and because she is certainly synaesthesic about other senses as well, so we've had lots of interesting discussions explaining colours.
the best analogy I know is relating colours to music, with pitch representing the brightness of the colour, and the sound of instrument representing the tonal quality of the colour, and the vibrato or shimmer quality representing the colours glossy or light reflective attributes, so for example blue might be light a clarinet with a dark blue being at the bottom end and pale blue at the top.
this analogy is inexact for obvious reasons but its probably the best I've found, since it does also let you talk about contrasts, and colour similarities and what not.
With our dreaming and singing, Ceaseless and sorrowless we! The glory about us clinging Of the glorious futures we see,
Our souls with high music ringing; O men! It must ever be
That we dwell in our dreaming and singing, A little apart from ye. (Arthur O'Shaughnessy 1873.)