Alot of work in this. I had this idea as soon as i read it and decided not to do it but got inspired on the last day about 5 o'clock. only took about 4 hours but was pretty tough and i still didn't get it like i wanted.
4 total photos used. each side of the face, the teeth and the bigger eye. I know some will vote it down because it looks like digital art vs a true photo but for the record i made up for it by submitting to the minimalism challenge:)
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I like the processing on the right side but I really feel that the dividing line detracts heavily. The right side seems more realistic than the red and black just is, to me, and so the line does not seem to be connecting the two sides of the face. I want to be able to give the benefit of the doubt here and say that the line is only connecting two photos (so the final image is a photo of two paper photos) but the border does not allow me to do that. (It would work if the red line extended onto the border, or if the border were not present.
Other things: Light in the left eye and not in the right is a tad distracting. Focus is good and colors are great. I like the "alive" feel to the colors on the left and the "dead" feel to the colors on the right. I think maybe the sharpness of the red "underneath" parts on the right could be increased for more realism. The cracked part is very effective looking. The shot on the right seems like it is a tad bit larger than the one on the left (lips look lower and eyebrow looks higher than the left). Some of your processing is a bit obvious - I specifically refer to the right eye where I can see a harsh unnatural line where it looks like the white of the eye was pasted in.
Okay, all that may sound like a lot of negatives but there are definitely things I like about this image - focus, colors, and cracked part as mentioned above. I also want to say that it is a rare image that will immediately grab me to do this detailed of a comment, so that in itself is a good thing. :-)