We can say much about the style of your admission essay.  Since these writing assignments generally call for you to tell a story about yourself, they invite you to write in a personal tone.  That tone should come from you and your voice.  I urge you to avoid trying to add an inauthentic “style” to your essay.  As William Zinssser, cautions in his essential book, On Writing Well:

There is no style store; style is organic to the person doing the writing…Trying to add     style is like adding a toupee.  At first glance the formerly bald man looks young and even     handsome.  But at second glance –and there’s always a second glance– he doesn’t look     quite right…The point is that he doesn’t look like himself. (1998:19).

When you write your essay, you will go through a process of finding your voice.   This voice is how you express yourself and come across as the real you.  And that’s what admissions committees want to hear.

Happy writing!
-Dr. Kirschner