Heh, the first three pictures remind me of the time I used a dating app called ' Plenty of Fish'. I quickly learned that if you get a DM from a woman with massive boobs on that app, 60% of the time it's a bot, 39% of the time it's a scammer/catfish, and 1% it's a prostitute lol.
But anyway, yeah I'm aligned with your range of prefect breast sizes in the real world. The fourth picture is the perfect size for me as my GF have a size similar to that. In manga/hentai smut like this work, I do like and tolerate bigger sizes like Rui's size as long as the breasts are round and not teardrop shape or sagging.