.Dude, Google "canada immigratio photo".  It is as simple as typing those three words.  Since I typed it here is what I found.  I've also pasted the link from cic web. 

Photograph and head size specifications 

• The face must be square to the camera with a neutral expression, neither frowning nor smiling, with the mouth closed.
  
• If the photographs do not meet the specifications, you will have to provide new photographs before your application can be processed.

Requirements

• Provide two photographs of yourself and each accompanying family member with your application.
  
• Your photographs must comply with the specifications below. If the photographs do not meet the specifications, you will have to provide new photographs before your application can be processed.
  
• Photographs must be printed on quality photographic paper.

Specifications

• The photographs must be identical and taken within the last six months. They may be either black and white or colour.
  
• The photographs must be clear, well defined and taken against a plain white or light-coloured background.
  
• If the photographs are digital, they must not be altered in any way.
  
• Your face must be square to the camera with a neutral expression, neither frowning nor smiling, and with your mouth closed.
  
• You may wear non-tinted prescription glasses as long as your eyes are clearly visible. Make sure that the frame does not cover any part of your eyes. Sunglasses are not acceptable.
  
• A hairpiece or other cosmetic accessory is acceptable if it does not disguise your normal appearance.
  
• If you must wear a head covering for religious reasons, make sure your full facial features are not obscured.

Photograph and head size specifications

• The frame size must be at least 35 mm x 45 mm (1 3/8″ x 1 3/4″).
  
• The photographs must show the full front view of the head, with the face in the middle of the photograph, and include the top of the shoulders.
  
• The size of the head, from chin to crown, must be between 31 mm (1 1/4″) and 36 mm (1 7/16″).
  
• Crown means the top of the head or (if obscured by hair or a head covering) where the top of the head or skull would be if it could be seen.
  
• If the photographs do not meet the specifications, you will have to provide new photographs before your application can be processed.

http://www.cic.gc.ca/english/pdf/photospecs-e.pdf