Flickr is home to a lot of interesting little experiments as well as an excellent source of fantastic pictures.

There is this one experiment called eye:hand. It's a fantastic way to see different portrait styles pitched against each other.

I'll let the creator explain the rules:

here's how to play
1. take a photo of yourself.
2. look at that photo.
3. draw yourself as you are in that photo.
4. email your photo, your drawing and your first name toeyehandproject AT yahoo DOT COM5. i will post them here.
6. come back and visit

So the result will be somefink like this:

The project is still young and not very publicised, but there are some great examples on there already. I like the guy who's done the Calvin & Hobbes thing towards the last page...

You can have a look here.