Chicago Booth Essay Tips
Once you have clearly delineated your thought process and established that the transformation was logical/intelligent (even courageous),
Go for it!
Chicago Booth MBA Presentation/Essay Tips
On to some "real" tips.
First and foremost, take some time to forget all the "creative" elements of this question - do not start wondering if there should be more pictures or less text or this color or that background - and concentrate on the basic question. What else and what more would you like the Chicago Booth admissions committee to know about you that has not been covered in your other essays? Get the answers to that question and ONLY THEN think of all the "presentation" options.
You can use the presentation to portray yourself from a different angle, to highlight different aspects of yourself or even to re-emphasize what makes you tick. Of course if you can show creativity, humor and insight through the presentation style you will score more - and have some fun too. Since the slides might be printed out for viewing, use clear text and bold pictures - and check the output in monochrome before finalizing the work.
Please take the sensible step of converting your presentation to PDF to maintain your formatting elements.
Finally, if the presentation repeatedly (repeatedly!) turns out to be a complete dud, feel free to use 600 words straight essay option.
Go for it!
Chicago Booth MBA Re-applicants Essay Tips
While the question only asks you to describe changes in your "thinking" your aim should be to go well beyond that and present all the professional, academic and personal improvements that make you a stronger candidate for Chicago Booth.
You have to succinctly answer "what has changed since Chicago dinged me last time?" State compelling reasons why you deserve a second chance. Detail the steps have you taken to strengthen your Chicago Booth application. Stronger work experience, professional achievements, better GMAT, international exposure or academic accomplishments can all find place in the Chicago reapplicant essay. Proactive Chicago-specific steps taken by you, perhaps based on direct or indirect feedback from Chicago Booth, might prove the trump card.
If you have gained new perspectives about your career goals or new "fit-points" with Chicago that did not appear in your earlier application this is the place to mention it.