Do you ever get to see what corvo looks like?

At the end, yes.

you do if you select the easy difficulty in the new game screen and in the ending sequence (the low chaos one at least)

You also see him on the difficulty screen when hovering over the easy difficulty.

EDIT: ^^^Beat me to it!

cinematic trailer gives the best view of corvo:
http://www.youtube.com/watch?v=iZ___7WU64Y

Like this!
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I hear you do see him in third person at the end (haven't gotten there yet).

For a very bare-bones first-person PC, he's so awesome. I like the fact that he is not über-godly. Even with his standing prior to game time and his supernatural powers, I feel like he's still an average man and being manipulated even by those who are helping him. Yet he does have agency on the world. I see it symbolized in his hands, which are powerful but not as large as some of the others.

It's a really hard balance to achieve and Arkane did it beautifully. Having a good, effective PC is not something you see people mention often about the game, but is one of the things that first drew me to the game and helps to connect to the world.

You can also see him on Wanted posters throughout the city.

You can also google him. Under his full name (Corvo Atano) of course, If you just put Corvo you get pictures of Crows and Ravens.

Edit: Lmao. That made my day, Sylthia.

I'd like to Google him.

....if you know what I mean.

http://24.media.tumblr.com/tumblr_m6rld0BHU71qkkw9mo1_1280.jpg

Just look at any of the Wanted posters during the game.