3. Stop telling the characters' whole lives in your foreword. That's an easy way to get your story exited out of. 

I really don't care if your main character is 25, blood type XYZ, they were born in Narnia, raised by wolves, and has a disorder where she falls in love with some random dude after the first chapter. 

Part of reading the story is for me to get to know the character; where's the fun if you tell me everything I'm going to know before I even get a chance to read it. Stop guiding me along like I'm not smart enough to figure it out on my own. If I have a question, I'll leave you a comment and you can use that handy quick reply button to explain things to me. But until then, stop giving everything away. 

That's like telling me before I go see a horror movie that the main character doesn't die. Well you, thanks for ruining my experience. So hurry. If you're at fault of this, run to your foreword before any other unfortunate person stumbles upon it. Instead of using biographies and pictures as fillers, try actually writing something. I enjoy using little anecdote using the story's main characters so they can get a taste of their personalities instead of you shoving the whole plate down their throats. If you don't know what an anecdote is, Merriam-Webster defines it as: a usually short narrative of an interesting, amusing, or biographical incident. It can be a little short story that may or may not contribute to the plot. If you don't want to do this, just put a little one sentence foreword (as much as I hate that , it's better than biographies.)