I would add how you aspire to be a leader and the importance of being a leader is. Also, mention in there about the importance of decision making, multi tasking and being decisive is as a pilot. Which it is. I haven't gone through the WOFT program but these are things that I put in my essay that I am going to submit. Key things that I have read on other sites were:
Don't say, I've always wanted to be a pilot ever since I was a little kid. Or anything along those lines. Everyone says that and it doesn't separate you from the others. Make yourself stand out and sound like a bad ass with out coming off as arrogant or cocky (which is hard for a lot of pilots haha).
Remember, this is how they get to know you before they actually talk to you and get the first impression.
Just my .02. Good luck!!