Some people seem to think that because something is "only" an opinion, then it doesn't matter. Pretty much all human decision making, kindest acts, the worst atrocities, is based upon opinions. Facts rarely have anything to do with it.
of course opinions matter, but frequently they are just that, opinions, not facts. Heck, even when there are actual facts, many opinions ignore them and are contradicted by them.
Here, there is no actual fact to push back against, it is all opinion / personal taste.
Just like you can like music I would not voluntarily listen to, I can find the picture to fall into superhero imagery rather than fantasy, want it to be grittier, or do not think she should wear glasses. To me these are all valid options, some of which I agree with. They are just as valid as liking the art for whatever reason you give.
The difference, as
@ezo said, is that the criticisms got a lot of back and forth while the ones who liked it were accepted and did not get pushback, despite both being equally valid and acceptable.
It is fine to say you disagree with someone’s opinion, I reserve the right to do the same. I don’t think we needed 100 pages of back and forth about glasses though, and as far as I can tell, not a single opinion was changed (which is not surprising, it is hard enough to do that when there are objective facts involved…)