It's a list of works. I'm sure if something is award winning or impressive in some way it helps. So add to it. But every kid who applies must have some sort of list of work. The writing samples are where they really get to see the spark, or so I've been told that is the difference maker. Polish those mothers up and engage the reader. And that working some diversity into the personal essay helps as I've been told by a prof who looked at my samples and wrote me a recommendation.