Stocks = royalty free stock photos
beach sand = sxc.hu [link]
Update: Someone informed me about Jim Warren's painting "Don't mess with mother nature" (thank you ~AnaBelenRuiz)
Although I never saw it when I came up with the idea behind "What lies under", Jim Warren's "Don't mess with mother nature" is indeed the first one that have this idea. You guys should checkout his work, he is an amazing artist.
thank you for viewing