Oops, forgot you said you wanted Liz as the name in it.
This was a free image i got from a search at http://office.microsoft.com/en-us/images/
There wasn't much more out there that looked even remotely similar to what you wanted, that was free. But if you want to take a look at istockphotos or similar sites, you can download images for pretty cheap. Look around and see if you can find anything else, if you don't want this one. I'll be glad to keep looking myself, but I might not be able to get to it for a few days.