This is not clearly defined. Generally speaking, as long as you have contact information, the employer can contact you in theory. But in order to improve your interview chances, a resume still needs some effort. First of all, you should have basic information, such as education experience, training experience and work experience. Secondly, if you want to be better, you'd better have a cover letter, talk more about the job you are applying for and make a targeted resume, which will get twice the result with half the effort. Third, you can upload some attachments, including your own works. In fact, photos are auxiliary, not necessary, unless you are interviewing for some positions that need image.