No problems. 
Just ensure you carry the similar photograph when you visit the examination center

They have provided a correction window.
Here is the process to open it
1. First open their official website
2. Scroll down and find Online Services
3. Click on the Correction Window
4. Login with your Registration no and Password
5. Try to change your photo

In case you failed to change your photo, don't worry. It will not create any problem. You must bring the same photograph which you uploaded where your face is clearly visible and can be easily recognized.