I would probably use "the" as well, but there's something in the back of my head telling me it's wrong.
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!