I think it depends heavily on the audience you want to write this for: like mainstream, men’s adventure, YA, or capital ‘L’ literature. I know the romance genres I read wouldn’t put the emphasis on her appearance instead of her experiences and agency. Dwelling on her appearance/not his is a concern of adolescent lack of confidence. I know my brother (a human) didn’t settle into his appearance until nearly twenty. Men’s adventure would glowingly dwell on her bust size regardless of her skill. Literature might bait and switch by having her be trans or aggressively asexual. YA would make it a lesson that there is no lack in the hero or curse in the different sizes for the three women.
Unless there’s a particular reason why being a busty elf adds to the story, that being an important aspect of her personality would be off-putting. Mine has changed as I rolled through lifestages, but I doubt and hope whatever size it was, was not even in the top ten things that people think is important about me. (I allow exceptions for medical like back damage or professionals like actors) There might even be an element of fairness, if the women are to be described for eyecandy viewpoints, describe the men as well. Like the Mandolorean actor looks real good under that beskar. Not sure if I explained it right, but comparing bust sizes would probably get me to ditch the story if nothing else softened the bad taste. Good luck!