Thank you @Bronte1985, this is helpful information.
I am currently writing my MA thesis in contemporary Chinese art at a MA program in Art History and I now realized I was incredibly vague in this post (it is my first grad cafe post). I was motivated by fear caused by ignorance, to ask this question before I have done any research on how to do a Writing Sample. Now I have learned more about how to craft a good Writing Sample, I realized that I could mend or bend or melt my original materials (given it a term paper or a thesis chapter) into a polished sample paper with (1) a strong argument (2) suitable research framework (3) necessary reference and interpretation that benefit my argument (4) originality of scholarship.
I went to the writing center a few times and found it helpful. I am also actively finding peers and professors who would like to lend a helping hand in revising my Writing Sample. Would you say I am getting a grasp on this type of writing? Do you have any other advices?
Hope this post can help others in need. Good luck to all!