I would probably use "the" as well, but there's something in the back of my head telling me it's wrong.
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Totally agree that the paper is about you, by you. If you don't use contractions when you speak, then don't write them in your PS. However, a lack of contractions can also read as a poor command of the English language (since you don't have to remember the contraction forms etc.) though I doubt that's what an adcomm would think.
One could, I whole-heartedly believe, have more control over their appearance than their personality or intelligence. Therefore, choosing to date women on the basis of physical beauty can be construed as seeking a personality-type that strives for self-improvement, a trait I, as most people I assume, consider admirable. Since, as they say, you can't fix stupid, it's best to focus on the things you can improve!