There could be many reasons why you didn’t get the job.Try and do the following before applying for a job:

• first of all, don’t apply for a job that you might over or under qualify for.
• make sure that you write a good cover letter- first impressions count.
• arrive slightly early for your interview.
• don’t be arrogant- remember that the first thing the interviewee will look at is whether they will enjoy working with you. • don’t be too relaxed- make your interviewee feel good about themselves.
• be confident in your work or knowledge and show that you are interested in the job.
• avoid only answering questions, speak your mind, e.g.  when taking him/her through your portfolio or talking about a previous experience, tell him/her a little story. Break the ice.
• do not talk badly about previous employers.If you have done all of the above, don’t feel bad; chances are, another applicant probably had a little more to offer. Call it coincidence and try again elsewhere.