Since my OC/Ponysona has changed quite a bit since her first conception, I decided to do a timeline for her.
July 2012 - First Concept
The idea for Genesis was spawned from a roleplay me and my friends were going to do, but never really got to. Each of us were given a specific power, and my character's was creation. Since Equestria was one of the places we were going to roleplay in, I was immediately inspired to make a pony character for it. I wanted something with a theme of the night sky and space with lots of blue gradients. Back then I was more excited to have a character that I wanted than a "realistic" character that someone could imagine in the show. The result was terrible.
Later 2012 - Total Redesign
I realized just how terrible she looked, so I removed the gradients and separated her hair into different color sections.
2013 - Improvements
Realized her cutie mark had way too much detail for a show-accurate cutie mark, so I improved it. I also changed her eye color to green, like my own. Her colors were still very dark for something that could be in the show.
March 2015 - Current
Thanks to critique, I lightened her colors. Now, aside from having three hair colors, which still isn't really seen in the show except for special or important characters, she looks like somepony you could realistically see in the show.
I kept the same outline to show it off because her silhouette never really changed. Anyway, I'm pretty happy with her current design, and I don't plan on changing it anytime soon.