Improve the consistency of your wirework. During a project, complete all of one type of wirework before moving on to the next. For example, wrap all of the pieces before you start linking them or adding loops. This will help you to keep an eye out for any differences between similar sections so that your work remains consistent and beautiful.
Use a light touch. It is easy to get a strong grip on your pliers while you are working with jewelry. Take care that you don’t squeeze too much, which may mar the wire. Use a light touch, and you will be less likely to mark the piece that you are working on.