I got my first couple about 2 months into the game. Then they came frequently. Got about 6 one week just by wrapping and gifting them furniture and clothes I didnt need. Then came Gayle and getting her picture was grueling. Despite her been the closest villager to me she took ages to give her pic even after I gifted her countless expensive items. Since then they've fully dried up despite daily gifting of expensive items. I know for sure all but Raddle are max friendship yet half the time now I don't even get an item back after I gift them.
Today I'll be doing the full inventory method Because I'm really sick of teddy and he needs to go. Maybe I'm paranoid but the update seems to of made pictures much harder to obtain.