This might be of interest to you http://www.canlii.org/en/ca/scc/doc/...canlii817.html it relates to Quebec as Quebec has special rules regarding the publication of images. and http://blog.privacylawyer.ca/2010/04...otography.html for the rest of canada.
"Journalistic, artistic and literary" expression are excluded from the need to require a release. But in court you have to prove the artistic merits of your work. It's also important to note that if you publish the work for yourself one or a few copies for your friends than this doesn't count as commercial the release is required for commercial use not private use. If you publish the work for monetary gain and you cannot prove journalistic (has to be news), artistic or literary expresion than you have to get a release.