Does the artist need to watermark the works sent to hr?

It is basically unnecessary, and it is redundant to add it, which will cause discomfort to the other party. Most people who have the idea of watermarking are thinking about preventing their works from being stolen, and this consideration is correct. However, this method is very discouraged. For the applicant: Before submitting the work or doing the test, fully investigate the qualifications of the company you are applying for and ask whether the test project is a past project or a new project (generally, the past project is selected for testing). If you think the company is reliable, you can reinvest in the portfolio or do test projects. If you feel unreliable, then don't do it and continue to apply for another job. Put all doubts, guesses and distrust before doing the test, otherwise there is no need to waste time doing the test. For recruiters, a slightly more mature recruiter will select candidates from many people at the same time. If you watermark others, you will feel that you don't trust the company and the cost of communicating with you is high. Of course, you prefer to choose others.