Those graphics are not available for download. Even if they were I would not recommend using the same images, what makes your website special is being unique. I do suggest searching inspiration on other wesbites specially if you are starting with web design but using the same images would be in fact not a good choice.
Please check www.freepik.com where you can download a lot of great quality images and you can follow the guidelines of the placeholders size to adjust your images on Photoshop or similar software and replae the placeholders on your site, creating a unique layout.
Hope it helps!