Photography is by its nature a tricky hobby. A fraction of a second can make the difference between a good shot and a bad one. For example, if you are taking a group shot and one person happens to blink as you shoot, you might not notice until later when you examine the image on your computer. Instead of discarding the image, you can quickly fix the problem if you happen to have access to Photoshop.
Load the photo you want to repair onto your computer, as well as one with a person whose eyes are open. This person should have similar skin tone and eye colour to the subject in your photo, and the head should be at about the same angle.
Open Photoshop. Select "File" from the menu and choose "Open." In the dialogue that appears, locate the image you want to fix and open it.
Select "File" from the menu and choose "Open." Browse to and open the image with the open eyes you need.
Select the "Pen" tool from the menu, and use it to draw a path around one of the eyes. Include the eye itself and the folds of skin above and below. Right-click on the path and choose "Make Selection. Select "Edit" from the menu and choose "Copy."
Go back to the image you want to fix. Select "Edit" from the menu and choose "Paste." Use the "Move" tool and the "Scale" function under "Edit" to place the eyes over those in the image.
Select the "Smudge" tool from the toolbar. Make the brush size small and choose a faded tip. Use the tool blend the edge of the pasted in eye with the skin below in the other layer. Repeat this process with the other eye and save your work.