Personally I think some characters can benefit from modifications to maximize sexual attractiveness but I voted for Same Model cause most character models generally are made to be good looking enough and only needing some improvements to be Greater.
So, maximize sexual attractiveness if you decide to modify but without Oversexualizing and that's the tricky part because people often misuse this words for their own agenda, biases or insecurities. In my opinion it's very simple though, Think about over reacting or over extending, To 'Over' react means to react in a certain way that doesn't justify The Intensity of your Response to a situation because your response served "no purpose" or even made things bad unless of course you did it deliberately then It's just manipulation and is not a 'Over reaction' to you only for them.
Same with over extending, It has no purpose, it can make things bad, it wastes resources and time and it can break things.
So, Maximizing sexual attractiveness is not equal to OverSexualizing, and this is where subjectivity comes forward, Some use real average women as the metric which is stupid in my opinion because that's just setting the bar too low , average women are not as good as they can be. a more reasonable Metric in determining what constitutes oversexualization are Models but even then they're not enough because We're integrating 'FANTASY' here.
and Fantasy doesn't have the common physical limitations of models let alone Average women.
Some say Tifa or other character models like her are over sexualized but I don't agree with that cause they are just setting the bar too low.
I believe she's very sexualized but she doesn't reach over sexualization yet if Fantasy is the standard here. and Fantasy do have a limit too , You can't just endlessly make some body parts bigger , it will reach a point of useless and if you increase it more then it will reach Grotesque.
And honestly in my opinion women who say Tifa is over sexualized probably is just insecure about their Boobs or something because other than Tifa's boobs her other proportions like her Butt and waist are not out of reach for Girls.
It's not like liking Tifa's tits will magically turn men off of normal women's boobs.