Gender-specific-alterations are generally only looked down upon when someone grabs a thrift store wig and some cotton balls so they can call themselves (insert-name-here)-sexy-no-jitsu.
I'm a particular pusher against such. Generally it's done poorly, and only for the sake of skanking up a pre-made character design behind the shield of "originality", as if that was any excuse.
I have, however, seen both an excellently done female Riku (KH1) and Kakashi (Naruto), constructed with actual effort with specific details of the original character still standing, and others cleverly adjusted to better suit the female form.
Your design does not seem to be intentionally attention-whoring and, done well, it could very well be one of the few to break the barrier of disapproval to impress those pre-biased against such an endeavor :> Best of luck!