Instead of being depressed about your last failed interview, you should email your interviewer and ask their feedbacks. Most interviewers are willing to give your critics and reasons why they don’t think you are a good fit. You will be surprised how much you can learn from your previous interview.
… the technicals of highlighting your strength, so I am not going to detail here. The bottom line is you should be able to answer any questions regarding your projects and how you made individual decisions.