It is amazing how much you can miss when you are writing. You become comfortable with your story and characters and you become blind to things you are doing wrong. That is why it is important to take a break from writing, then go back and reread your work. Also reading your work out loud can be a huge benefit. You brain is a powerful tool that will lie to your eyes. You think you are seeing one thing, but when you read out loud you catch what you thought was there and isn’t.