I'm calling this a Beaked Cyclopsfly.
These instructions are for Photoshop.
Choose an interesting image that has at least one good eye or eye-like thing that could potentially be conceived as looking straight at the camera. If there is work to be done on correcting something such as the eyes or some cloning etc in the half of the image you're using, be sure to do that editing before you create the flip.
If necessary, create some extra canvas to make room for the flip. Using the Rectangular Marquee tool, select the side of the image that you want to use. Copy (ctrl+c), paste (ctrl+v) and then go to edit/transform and choose 'flip horizontal'.
Use the move tool to line the selection up with the other half.
If you think a different angle or selection might look better, go back to the rectangular marquee step and try again. Maybe a slight rotation of the image will produce something better. Experiment a lot.
Once you're happy with what you have, zoom in to a detailed spot along the center line where the 2 halves join, select the Move Tool and use the arrow keys to nudge the selection into place. Once the 2 side are lined up, flatten the image (shift+ ctrl+e).
Zoom back out and crop.
You're creature is now ready for any further tweaks.
For some inspiration, visit Dave Phillips' site at
http://critterscapes.zenfolio.com/p89658114
Not everything has to have eyes or even be an animal! :-)
