I keep two pictures on my dresser ALWAYS! A picture of me when I was'nt happy with my weight, and eating habits. And a picture of the NEW me happy, and healthy. It keeps you in check, to maintain the new you. And a constant reminder of all the hard work you put into changing you life. You might say 'Ughh" looking at the one, followed by "But look at me now!!"
When using a "to do list" make sure to "check off" your accomplishments instead of erasing or scratching them out. That way instead of seeing all the things you didn't get done, you can feel good about all the things you DID achieve.