I've been working on this post for several days, and this morning I found Lorelle's Blog Challenge: Intelligent Online Toys and Play Things, which inspired me to get back to it.
You upload a photo, and they have an artist do a sketch. I would say, based on this, that they make an attempt to flatter. When I signed up, it was free, but now it costs $5 to get one done.
You can play with it quite a bit, with different backgrounds and 'outfits'. You can even pose with celebrities and aliens. Here's a glamorous version:
You can also make one with one program, then mess with it in another. Here is a Uvatar that I spherized with GIFWorks:
What you can't be is fat, even if you are fat; or old, even if you are old. That seems to be the case with most of these.
The Perception Laboratory’s Face Transformer is another, that I've linked to before, that works from a photo you upload. Here I am, in the styles of Modigliani, Botticelli, and Mucha:
I rather like these, especially the Botticelli.
Here are a few others, some of which you've seen here before:
My favorite, from BuiLD YouR WiLD SeLF: