I haven't read through all the posts, but if you have a high enough friendship, you might get the pic by
- giving the villager a perfect fruit when they ask for any fruit or a regular version of a certain fruit
- giving the villager customized furniture
The only thing is that I've sometimes gotten the furniture that the villager wanted to replace instead of another random item, which can be annoying, but I can't really tell when that's going to happen. I've gotten Moe's pic from giving him customized furniture, I've gotten Olivia's and Cally's pics after they moved away, and I've gotten the rest through the mail when they were still living in my town.
- giving the villager a perfect fruit when they ask for any fruit or a regular version of a certain fruit
- giving the villager customized furniture
The only thing is that I've sometimes gotten the furniture that the villager wanted to replace instead of another random item, which can be annoying, but I can't really tell when that's going to happen. I've gotten Moe's pic from giving him customized furniture, I've gotten Olivia's and Cally's pics after they moved away, and I've gotten the rest through the mail when they were still living in my town.