I don't know about the chances of being denied. I think if you put in a complete application, adequate evidence, do your best to explain any 'unusual' occurrences and it's evidence to an officer that your relationship is genuine, you should be fine.
I think color photos are better just for clearer viewing. You can do it that way or transfer onto a USB stick and print in a photo store. For evidence, here are some ideas(based on what we gathered):
- photos of you guys, you guys with your families and friends(very important), with your witnesses, with the person officiating the ceremony, etc. People should be smiling and dress well for the occasion - someone in the forum was rejected and I think one of the issues was guests were dressed casual, weren't smiling, etc.
- describe briefly what's happening in photos, who's in it, date of event, who took photo.
- print screen shots of facebook photos with comments from family & friends
- after marriage, change your status with Canada Revenue Agency(can do it online). Print screen shot and write date you did it - to help show you are merging your lives.
- copies of comments from wedding guest book
- if you videotape the wedding, attach some excerpts of speeches from family, friends, etc
- benefits package at work, RRSP, TFSA, insurance - consider adding each other as beneficiary. Joint bank account is good too.
- traditional/cultural ceremonies particular to spouse's country - do them. If not possible, explain why and whether you plan to in the future. If his family can't make it, explain why.
- copies of letters, cards, gifts(I printed photos of gifts) from family & friends wishing you well, etc.
- copy of wedding invitation if available
- thank you cards - you can take a few photos of some of your thank you cards
- if you attend marriage counselling - include copies of 'certificate' or letter from Minister attesting to attendance.
- wedding dress, wedding bands, etc - keep receipts. If you go dress shopping with anyone, take photos. I read a case on the canlii database - rejected for non-genuine relationship, plus officer determined the rings were fake.
- telephone, chat logs, emails of your communication
- I think where you guys live with your mom, an affidavit from her about your relationship will be helpful
It is a lot of work, but can be done.