I need to use dinosaur/dragon eggs in my game. I have found out this resouce from Behance.net. I am not sure how to download these resources. Can anyone help me with it.
This looks to me like an artist's portfolio, a page where they demonstrate their skills to potential employers.
As Pikalek points out in the comments, the license specified on these images is CC BY-NC-ND 4.0. That means you can download and distribute the images only unmodified, with attribution, and for non-commercial purposes. You can't build upon them/use them in derivative works like your own game without contacting the rights-holder to negotiate a different licence.
Judging by the caption, rights to use these assets in-game are likely exclusively owned by the studio that made Tiny Miners.
So, if you want assets like the ones shown there, hire the artist and pay them to create assets for you.