Editing my still life images

As mentioned in the previous post, after my shoot with the Hasselblad and the still life subjects, I now needed to composite all of the different parts of the image to create one whole photograph of commercial quality. Do do this, I used layer masks. Here are all my final layers which I will talk you through below. First, I opened the first box image as the background; I created a copy of this my having the background selected and pressing control and J. This wasn't necessary in the end however I wanted to just ensure I wasn't touching the actual background and if anything needed retouching on this layer I could go back to it easily and delete the retouching if need be while still having a background. I then added the base layer for the bottle. I did this by simply dragging the bottle image to the photoshop file I already had open. This opened the image on top of the box image. However this doesn't place the file perfectly on top of the other one, in the ex...