Does it matter? Just get your picture taken and ask them to make 4-6 copies. This is a very small detail that is not that important. As long the picture is a current picture of you and it meets the required specification.
yes, it does matter.
I just came from the interview, and I had initially made 4 photos, but the 2nd NL requires 5 in the instructions, so we took a new 5 set with us to the interview, and the officer switched the ones in the medical package with our new set of 5 pics.