The two images here show how a single image can be presented in different ways. The first is the original image (some texture added, of course). The second image is simply the first image using a mirror montage as mentioned in other posts.
If you work on this technique and decide to use textures as I did here, I recommend first creating the mirror montage then apply the texture. I first tried by simply making a mirror montage of the first processed image (after the texture was applied ~ lazy, I guess). But, it didn't work so well. Too much texture and not enough control of the texture. So, I went back to the files and used the original, pre-textured image, made a mirror montage, then applied the texture and adjusted it to my liking.
When it comes to techniques like this, the bottomline is its' all a matter of personal taste and satisfaction.