The full picture is never used in academia, let me assure you of that. If it weren’t for articles like these, most people would not know where it even came from or that the model was nude in the first place. Not defending the use of the picture, strange choice of a test picture for sure, if you know where it comes from but wanted to give you some context.

I’m still not sure what you are trying to say, milk has all 20 amino acids, both the essential and the BCAAs. The study you linked is on BCAA supplementation alone, not milk

What do you mean? Milk is a complete protein mening it has all 9 essential amino acids. It also has them in good amounts in proportion to what humans need. See https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5149046/