Describes, in nauseating detail, what their character looks like, even eyelash color...
Names the characters for their attributes or personality. No legit writer does that.
Does not understand how to put their words into sentences without using awkward language and way too many descriptive words.
Spends tons of time on the first paragraph instead of writing the story and going back to fix issues later.
Does not understand that what they wrote is a FIRST DRAFT. It will take five or more rewrites to turn it into something publishable.
Does not understand how to craft a plot that moves forward without a ton of fluff (unnecessary stuff) dragging it down.
Uses clichés in the writing, the plot, the characters, the situation leading up to the start of the story, etc.
Focuses on fan fiction and thinks it's what the world wants to see. Copyright means the original writer OWNS the characters, places and plot line. You won't get your stuff legitimately published for this reason.
No, writing children's books is NOT easier. The competition is hard to overcome and the writing has far more rules than you think it does.
Learn basic English. Get yourself a copy of Strunk and White. And a Thesaurus. And a Dictionary, or find those functions on your Microsoft Word.
USE spell check. Please.
Not really listening to critiques after you asked for them, or asking for 'what do you think' instead of 'where did I drop the ball here, what isn't sounding right, where does it need fixing'.
Jumping on the vampire (or occult/mermaid/werewolf/witch/half demon/ therian) overdone bandwagon. And yes, this means dystopian stories too.
Telling instead of showing. There's a craft to writing, it can be done wrong if you don't do your research.
Always using first person point of view. No, this is not usually the best POV to pick to tell your story.