To create a professional image in your job application letter, you should

Lse positive emphasis to sound confident.

use your knowledge of the company, your coursework, your understanding of the field, and your experience in the workplace and extracurricular activities to show you are unique.

use you$-$attitude by supporting claims with specific evidence and relating your experience and knowledge to what the employer needs.

repeat information the reader already knows and lecture them on their business or company.

focus on your need to gain experience.