Seminyak is the most upmarket of the west coast's beaches, the atmosphere is more sophisticated and laid-back than Kuta, and the beach in particular is quieter during the day, although this area too is developing fast.
And here is Seminyak Beach picture, that posted by various photographer at Flickr.
All this picture are found on public area. Go to flickr.com to see the larger size of the Seminyak Beach Picture.