My opinion is, because you have to go through Singapore visa office, the amount of your relationship proofs should be more than average. The reason is Singapore VO is one of the toughest VOs in the world. It has one of the lowest acceptance rates at 72%, it has the second longest processing time in the world at 30 months. People lately have been getting 24 month wait times just for an interview. You need to avoid the interview at all costs, as it adds a significant delay, therefore you must absolutely convince this VO that your relationship is genuine enough that it does not require interview.
For the most part, the people on this forum are right, you should emphasize quality over quantity of photos. But think about this also. Photos are arguably one of the most important pieces of relationship evidence you could have. It's the only proof that actually shows you physically with your spouse. It's the only HARD evidence that you and your spouse were at a specific location, were with certain family members, were at a certain event, etc. They're the only evidence that can show how affectionate you both are when taking pictures, VOs will sometimes comment if the couple looks compatible or not on the GCMS notes. You know the old saying, a picture is worth a thousand words? You don't necessarily have to do redundant things like showing 10 photos of you guys together on the same day/event, or 10 pics of you guys in the same room doing a different pose each time.
For myself, even though i sent 400 pics, I chose the pics that showed my wife and I really were truly together everyday I was in Vietnam. For the most part, I just showed only one picture of us together, per day. However, if on that day we did multiple things together (ex. morning = eat breakfast at restaurant, afternoon = play games at mall, evening = watch movie), I would just show one pic for each occasion. On days where we are together with friends or family, I would just get one picture of that day of all of us together. That way, the VO knows that we were truly together for the period of time that we stated, with no gaps in between.
On the wedding day, even though it's just one day, I sent about 60 photos of the traditional ceremony in morning, and 40 of the reception in evening (total 100 photos for one day, which is already the same amount as what you're planning to send for your entire application). The reason is because Singapore VOs will look carefully to see if a wedding was done in accordance to tradition, and also if the reception appears to have the # of tables/guests as stated. I've read many cases on Canlii.org where the VOs were asking, "Why was there no street procession? Is it because you dont want neighbors to know you are married? Why was there no exchange of gifts? Why no praying in front of altar of grandparents?" You might think that's crazy why would they ask that, but they DO! So for my wedding pics, I made sure to show we did everything in the book. One pic of us exchanging rings, one pic of the gift exchange, one pic of praying at the altar, one pic of serving tea to parents, one pic serving tea to brothers/sisters, one pic of street procession, etc. At the reception, I showed pics of the seating arrangements, our parents standing on stage with us, us pouring wine through the tower of glasses, cutting cake, walking to each table toasting, decor, etc. What I did was not redundant, because I made sure to show we did everything that was supposed to happen during a traditional ceremony.
You see? Quality over quantity that is true. But your ultimate goal is to convince the VO your relationship is genuine. If you think you can do that with 100 photos, go right ahead. But 24 month wait time for interview, a 72% acceptance rate, Singapore VO is definitely not a VO to mess with, and it's your job to show them your relationship is genuine. Personally, I don't see the harm in sending more pics, as it doesn't take much more effort, you're just simply dragging/dropping more photos onto your USB and printing out more, but how much extra work is that? To avoid a 24 month interview wait time? I'd say an extra 30 min to print more pics is well worth avoiding waiting another 2 years for your wife to come here. Besides, CIC does not specify a limit on the # of photos, so go nuts.
Good luck