Problems coming up with Images on my new post, please help me out

Hello admin, i have just written an article with one of the aspects of pregnancy. I have been trying to upload the pixabay pics for that post but everytime i add the url of one of the photos i am given the message: 

• This URL does not point to a valid image file.

These are the two images url i am trying to add:

http://www.shutterstock.com/pic.mhtml?language=en&id=109733177

http://www.shutterstock.com/pic.mhtml?language=en&id=111643082

Everytime this message occurs, i tried to save the pics on my laptop and then upload then 'shutterstock' is being shown written on the images. I want to add pixabay images which are better than flickr ones.

What am i supposed to do? Please Help..

The top row of Pixabay images actually belongs to Shutterstock, which you have to pay for.  Once you do, then the watermark disappears from them.

The rows underneath are all Pixabay and they are free. :)

Thanks a lot, i went to the site and had a look and understood it well now, Thanks for helping me out