At first create a Student in openSIS. You will get the upload student's photo option after you save the student's details. Select the student you want to upload a photo for. Then click on the Upload Student's Photo option marked in red in the screen shot.
You need to have the student's photo saved in your machine. Then Browse the pic and upload it. The Student's photo can be previewed & cropped as required, then clicking on the "Upload" button woul upload the student's photo.
Now the student pic is uploaded. To change it click on Update Student's Photo marked in red in the screen shot and follow the same process as mentioned for the upload.