• Over use keywords.
• Do not use cliches.
• Do not use more than one keyword in a sentence.
• Too many adjectives with not enough information to back them are useless.
• Ensure that your profile matches your recruiter's needs and the position you are applying for.
• Ask a friend to proof read your CV.
• List a set of particular skills you want to highlight in you profile.
• Profiles should be short and concise.

If you cannot come up with a good profile because your skills, experiences and achievements do not match the vacancy, than you should consider whether or not you should apply for such a position. Maybe you have identified what you still need to study or which qualifications you need to get in order to be eligible for positions you would like to apply for.

Remember to be consistent in your personal profile and the rest of your CV