When my image is rendered only my sky texture shows up

Hello there when i render my image only my sky texture shows up. i also have a couple of questions, is it possible for me to be able to put the sky image texture in the 3d view and be able to view it live with my model? Is there a way for me to turn the pillars and lion into something quite old and dirty so it looks like an almost destroyed temple? could i do this in blender or do i have to render the image and then do that on photoshop. for some reason my blender file is not uploading unto the attachments section of this site.
Thanks so much

hope this helps