Here's one cool trick in which you see the eyes of the subject open and closed at the same time. This trick is done in camera and no Photoshop is used.
An ND filter, a sturdy tripod and a cable / remote release will help even though its not absolutely essential. The eyes of the subject were open during the first half of the exposure and closed for the second half.
It is important that the subject remains perfectly still during the length of the exposure.
|Trick Photography - Long Exposure - Eyes Open and Closed in Same Picture|
Camera: Canon 5dmkii
Lens: Canon 24-105 f/4 L IS USM
Shooting Mode: Manual
Shutter Speed: 2"
White Balance: Daylight