Loose words like loose muscles don’t make a poem look so great. Tightening up a poem so it does not have words that do not belong there. This is very necessary for bringing poems to another level. It is also good not to be too concise. You want to leave the reader wondering what it is you are trying to say. Being to obscure is no good, I always struggle with this. I have too many ideas at one time. If you read great poetry you will realize that the poet took the time to construct each line so that every word belongs where it is. Sometimes you can work on a poem for a while trying to get this exactness. Sometimes it just does not come. It is always good to have a couple poems going at one time so you can be working. This can up your productivity while attaining that nice tight poem of eloquence.