When writing an Upwork proposal, it is important to first show that you have read and understood the job posting. This can be done by mentioning specific details from the posting within the first sentence of your proposal. It is also important to tailor your proposal to the client's style and respond to their requirements in the same order they are listed in the posting. Providing a relevant example of your work is a great way to showcase your skills and prove to the client that you are capable of completing their project successfully. Additionally, it is crucial to establish trust with the client by highlighting your experience and qualifications. Finally, make sure to keep your proposal concise and to the point, as clients are more likely to respond to proposals that are well-organized and easy to read.