I think you look great and you did a great job at transforming yourself!!
I have to agree with some of the others with regard to whether you did it naturally or not. Bottom line is, irregardless, you did a kick ass job in less than a year. Its not my business or anyone elses if you did it with ah...."assistance" - picture number 3 looks to me (just my .02) that you may have added a lil winny to your diet / exercise routine.
Let me again reiterate -- its no one's buiz if you're natural or not. My problem with those who do lie about using or not is that people are lead to believe that they can look exactly like those before and after shots when in actuallity, they may not be able to w/o some "help".
Keep up the good work!
Winners never quit...Quitters never win!!!