Create images in a pair of sunnies - using a Clipping Mask Effect. Another bit of fun and easy to do, once you know how!

The images selected here, but go and research your own images. The samples below will give you the idea.
Image sizes do not matter too much, but recommended 1024px up. They do not need to be the same size. But small images as this will not be as effective.
1/. Ensure in Photoshop the layers are turned on. (Windows/Layers) and this panel will sit on the right side of the window.
2/. File Open the person image first, then the scene.
3/. On the person image Layer/New Layer and name it left lens.

4/. Then using the Magnetic Lasso Tool, draw around the lens of the left sunny.

In using this tool, keep to the borders and do not take your finger off the mouse. When done, double click on the end and this will enable the lasso to be highlighted. The Magnetic Lasso can be moved at each point if you over-run the outline.

Try to be as accurate as possible with lassoing the shape, as it will show later if the shape is out of proportion. Without doubt this is the hardest part of the exercise!
Rough edges look horrible and smooth edges look really great!

Using the Paint Bucket and black paint fill the left lens. Then make sure you de-select the squiggle around the sunny lens, by Ctrl D.

5/. Then copy/paste the tropical scene (or what ever you have chosen) onto the left lense.
If you need to reposition the top image, use the Move Tool (top of the Toolbar), to position the image to take the best view.

You can adjust the positioning of the image by using the Move Tool.

6/. If you need to align the image better onto the sunny's lens, use Edit/Transform and the Move Tool (Top of Toolbar) to align your image.
7/. Now with the top layer selected, Layer/Create Clipping Mask. The Background Image, will now fit in the left sunny. Rename the layer "left lens filled".
8/. With the Move Tool, place the section of the person image where you want it to be.
Now for the right sunny:

9/. First, select the original image with the person in the person. Create a New Layer and ensure it is placed at the top of the layers. Rename the layer lens right.

10/. Repeat step 4 above: Using the Magnetic Lasso Tool, draw around the lens of the right sunny. Using the Paint Bucket and black paint fill the right person lens.
11/. If you need to align the image better onto the sunny's lens, use Edit/Transform and the Move Tool (Top of Toolbar) to align your image.
12/. Now with the top layer selected, Layer/Create Clipping Mask. The Background Image, will now fit in the right lens. Rename the layer "right lens filled".
13/. With the Move Tool, place the section of the person image where you want it to be. You can either make the lens views identical, or different, as in the example.

The final image. Click on the image for the full size. Here is the first example completed as a .JPG image and a second created using the same steps, but with a difference. Click here to find out what the difference is.