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Here is a simple way to give objects reflections, there are many ways this can be done, but I find this method quite attractive due to how simple it is.
All the images that I used are included in the support file, as well as a PDF version of this tutorial.
1. Open your reflection image and your sunglasses image and drag the reflection picture onto the sunglasses image.
2. With the reflection image layer selected use the free transform tool (Edit - > Transform - > Free Transform or Ctrl+t) and reduce the size on the reflection picture until it is roughly the same size as one the lenses of the sunglasses, Hit the 'enter' key when you are happy with your sizing.
Location of the free transform tool
3. Because of the curvature of the lenses, the reflection will also need to be distorted. Drag your smaller picture to the center of your canvas and then apply a Spherize Filter (Filter - > Distort - > Spherize).
Location of Spherize Filter
I used the following settings:
Resize your reflection image to fit your lenses again.
4. Duplicate your reflection image, (Layer - > Duplicate Layer') and move the duplicate layer over the other lens.
Location of duplicate layer
Image with both reflections in place
5. Reduce the opacity, (found in the Layers Palette) of both reflection layers till you can clearly see the sunglasses under them, I used a value of 15% for opacity.
6. Now you need to select each of the lenses. You can do this using whatever selection tool works best for you. Since my lens is colored quite uniquely so I used the Magic Wand tool.
7. Once your lens is selected, select the reflection layer that is over your selected lens, and click the Layer Mask button on the bottom of the layers palette.
8. Steps 6 and 7 need to be repeated for the other lens.