By now you've all heard about Divesity and Comics. He watches the train wrecks so you don't have to, but he does it in a way that really helps readers understand WHY current Marvel sucks worse than [insert Razoerfist analogy here]. Now, the man talks about individual comics for the most part, and the teachable moments are spread all over his channel, but after a few videos you start to notice a few trends about Marvel's bad writing, specifically when it comes to writing women. Those trends are worth looking for, because his laments about what was lost when the Pigs took over the Marvel Farm provide solid advice for ways to make your female characters more well-rounded, more diverse (in the classical and not SJW sense), and more believable.
Basically, don't make them all mannish women, and don't make them all walk, talk, think, and act like immature Manhattan millennial women who think the world is out to get them.
For a more concise commentary on writing female characters, look no further than this video by Mr. Plinkett. For all his faults, the creepy serial killer knows his story structure, comedic timing, and characterization.
That video right there is a clinic on how to write better characters, how to write better pacing, and how to deliver a punch line Take his commentary to heart, don't be Paul Feig, allow your characters a little vulnerability - especially your female characters - and you'll be writing at a level well above that of your average milkshake drinking millennial.