You are welcome to use photos in this site. If you don't crop watermark out, you may use without contacting. If you remove watermark, please credit either name or website. Please feel free to contact if you want some photos at higher resolutions. (As some photos are upload to Shutterstock, or other photo stock sites, giving credit is not for me, but for yourself not to get problem with those stock sites, as it proves that you got a direct permission from the photographer)