Your employee self-evaluation should focus on the broad scope of your career, including your present and future. Keep the dialogue open, as this encourages your employers to look deeper into your profile as an employee, allowing you to stand out.
During self-evaluations, ask yourself difficult questions as well, especially as they pertain to your skill set. Focus on your strengths and weaknesses, and determine how you can improve for the next period of employment. Staying positive is vital as well, as a large part of the evaluation should focus on your personal growth and your feelings towards and expectations regarding the future.