try deviantart.com you might find some free material as long as you reference the photographer.
Thanks Gordon, it's a wonderful esoteric site but i am looking for something more specific, showing landscape design perspectives and styles.
If your prepared to pay a couple of bucks there is a host of royalty free images out there. I have used them in the past for marketing. You can get anything you want.
Use this link: istock photo is brilliant but you have to pay