These are some of the best webs to watch pictures of the A350 flight prototypes.
AIRBUS web has a wide quantity of professional photographs.
When talking about spotters in Toulouse, there are 3 of them with very good pictures:
Other spotters who have some pictures of different A350 flying prototypes are:
David Barrie http://www.flickr.com/photos/curufinwe-xiane/
Jujug spotting http://www.flickr.com/photos/jujug/
Jérôme Vinçonneau http://www.flickr.com/photos/mav31/
XFW spotter http://www.flickr.com/photos/xfwspotter/