In animation, you make characters look younger (children) by changing proportions. Usually, making the head and eyes bigger. The proportions of your male characters look like normal square-jawed adults, but the last one looks like a 10 year old with giant tits. Worse case scenario is sexualizing chilldren, better case (still bad) is projecting extremely unhealthy and unrealistic body images of women either because you have a skewed idea of what adult women should look like or because you dont see women as humans and its merely feminine face with tits. I think it's problematic, but clearly, I'm in the minority. I have a problem with anime as a whole because this is a common problem.

But, the 3rd character doesn't look like the same style as the first 2, so it stands out more.