If you are going to draw in sidewalks as separate ways, it's important that you add all the crossings as well. Without them, routers can't route people properly! I have written a guide to how I (and a few others) are mapping sidewalks in the area.
https://www.openstreetmap.org/user/une%20abeille/diary/402005

Also please also make sure you're using the correct offset for Bing imagery. For Montréal, this is 0.6,-1.54
https://wiki.openstreetmap.org/wiki/Montr%C3%A9al

I would very much appreciate it if you could pass this on you whoever assigned you this project, so your fellow students stop making basic mistakes.