No it doesn't or at least I don't know about it if it does.  I upload sims to the exchange a lot and I hate the stupid looks they get on their faces sometimes but you can't choose their expression.  Which is why I would love to be able to upload them with screenshots.   I have only seen a hand full of people upload sims the way I have posted earlier so there must be some hidden secret.

Anyone know how to upload sims to the Sims 3 exhange using screenshots?

Like this.....

http://www.thesims3.com/assetDetail.html?assetId=816778

Please help.  I can't find this anywhere.  I have looked all day....pathetic I know but I did.  Thanks so much.