As someone who also recieves comments about my OCs chest size, I don’t see anything wrong with your art. First off, the word “sexualizing” is just being thrown around. Having a large chest isn’t even a sexual thing on its own. Second, the context has to be sexual or overly lewd (aka a lewd outfit or purposely changing a character to have a larger breast size) in order for it to be “sexualized”, otherwise, it’s just a large chest. It’s also kind of scummy to claim something is “sexualized” just because a woman has a larger chest (ᇂ∀ᇂ;)