Free Range Librarian has a slew of tips for better writing. For example:
Reduce, reuse, recycle. If you like a riff (or scene, or character), but it doesn't fit in the piece you're working in, boldly whack it, and save it separately. I had an entirely essay grow out of a paragraph I cut from another essay where it really didn't fit at all, and the cutting grew the better, stronger plant.
There are many more, many of which could very well be new to you. It's a great resource for any writer. Thanks to Rose for the tip.
Being Able to Write: Lessons from Other Writers, New and Well-Seasoned