Ultimately it's your choice, and the core question really should always be:
"Do I think sexualising my main character will distract from the story I'm trying to tell?"
Which may boil down to:
"Do I want the reader to see THROUGH my character or look AT my character?"
In the case of my comic, I feel that yes, if Rekki was drawn more like a sexual object rather than a pretty average looking young woman, it would make her less relatable as a person who made some bad mistakes in her teens and is now burned out, kind of a loser and struggling towards redemption. (I'm just going to assume we're all on the same page that sexualising the fourteen year old Rekki from the prologue would be bad under basically any circumstances, so I'm talking about the twenty four year old version of the character from chapters 1 onwards). It's important to me that the reader sees her as a person, not an object.
This is kind of why the main character in a story is usually drawn just quite pretty, cute or nice looking but not objectified, while the love interest is the one more often drawn as something to drool over. The reader is meant to be able to see the protagonist as their avatar in the story, and in some cases this is hard if the protagonist is being objectified, because it tends to have an "othering" effect if you draw and write them to be gazed upon rather than lived inside of. The only time there's an exception is if the fantasy you're selling about your character is the power fantasy of "being really sexy and in control of your sexuality", like say Bayonetta or Harley Quinn (where for some people it's like the equivalent of the masculine power fantasy of being a big, muscular superhero), OR if the protagonist is meant to be drooled over while the audience is in a sort of voyeuristic role watching things happen to them like an outside observer. The first of these can easily accidentally slide into feeling like the second, and while it's totally valid to make a story this way, it will inevitably make it harder for the audience to put themselves in the character's shoes or relate to them emotionally if they're framed just as something to look at.