My 2 cents, although Canadian cents are obsolete,
They only look for things that stand out of the ordinary, not things that look normal - big age gap (no you have to get married to a person who is no more than 5 years or so), previous history (again, no, Indians aren't supposed to get divorced or be estranged, although you can do it once you are in Canada, its a free country), key members of the family not attending the marriage (parents, in-laws etc, this is only because ours care enough to attend it in the first place).
Sending in additional documentation, although isn't bad, but if it isn't compelling or strong, is of no use (for e.g: parents haven't attended the marriage but you have 500 pics and have chat logs for a year would still be read flag and a trigger for a personal interview). While submitting documentation think like Canadians do, small wedding, no parents, even better if you have kids walking you down the aisle ... oh wait ... red flag for NDVO.
On a more serious note, I've had friends who sent in 10 pics and 10 pics only and nothing else and got their visa without an interview.