Visit any aadhaar card enrollment center along with your aadhaar card number,They will give one update form/ correction form. Fill the application form completely in all respects and also fill the mandatory fields in options tick aadhar card photo change.You will have to do your finger print scanning, iris scan and photograph capture. After taking the photo, you can ask the operator to show the captured photograph and if you not satisfying, ask him to retake your photo once again.After completed,you can take print out of the new aadhaar card with same aadhaar number. Your details will be sent to the data center of UIDAI for further processing. Wait for 2-3 weeks, then you will get your aadhaar card with the same 12-digit unique number and the new photograph.