How to make a smooth skybox

I am making a skybox for my game using pictures from the internet, but when I try put all the pics together in the skybox, my game looks too…boxy. How do I make my images more smooth so that they skybox looks like a vast environment?

Search google for how to make a skybox, but skyboxes will always be somewhat boxy to a degree. There are several programs out there that will generate skyboxes as well. You should use a sky dome, or better yet sky hemisphere. They will use more geometry, but it’s a small extra cost for the benefit.