Where can I get free cool pictures for my blog ??

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I have just started a blog with Wordpress. As I am new in this field I really don't know how to start. My blog is based on health and beauty and I have a number of post ready for posting. Now my problem is from where can I get free pictures to upload in my blog. Since its a beauty and health blog I need a large number of good quality pictures to make it look more attractive. Can anyone suggest me good sites from where I can upload high quality pictures for free. Since I am a newbie I don't want to invest any money now. And I am really afraid because most of the pictures in most of the sites are copyrighted stuff. Please help me guys. I want to start posting as soon as possible. Many thanks !!