No, that would only make the scene smaller. Why not just doing a google search for sky texture, or just plain old "sky" and make sure you have Large selected for image size. Or just do a quick web search for it and maybe you will find some good texture websites.
EDIT: SHAZZAM. how do you like me now? Nice model by the way.
(make sure you save the WHOLE PICTURE, just hold your cursor over the picture until a little box in the bottom right corner comes up, then click on it, it should enlarge. Then just right click, save picture as)