Seven Deadly Sins
"Although you can take many steps to strengthen your writing and to make it captivating, some easily avoidable mistakes can detract from or possibly destroy any positive effect your efforts may have. We have chosen seven of the most destructive mistakes that you should avoid at all costs in your poetry. These errors—or the 'seven deadly sins' of writing—will do enough harm to your verse that no amount of formal perfection will counteract them."
From Denny: Poetry.com has some good advice for veteran writers who may have fallen into a rut of their writing. It's also simple and good advice for those aspiring writers looking to improve their craft.