I have seen that brother, when you will be going to upload the pic you can find following information.
Frame size
- The final frame size of the photo must be at least 35mm x 45mm.
- The photographs must show a full front view of the head and tops of shoulders, with the face in the middle of the photograph.
- The size of the head, from chin to crown, must be between 31mm and 36mm.
- Digital dimensions are often expressed in pixels or DPI (dots per inch). The physical dimensions in pixels must be at least 420 x 540.
Quality/resolution
If an existing photo is being scanned, the minimum resolution must be 600 pixels per inch.
File format
- The file may be submitted in JPEG or JPEG2000 format.
- The final size of the image should ideally be 240 kB (kilobytes), but not less than 60 kB.
- The image must be in colour (24 bits per pixel) in RGB colour space, which is the common output for most digital cameras.
It does not ask for backside of photo, again they are asking for JPEG format. And you can not put both sides of photograph in one jpeg. Dont worry just upload front.