So first of all I gathered the reference I needed.
1) Clothing and design ref from the wiki
2) Pose based on a drawing from the book Anime & Game Characters vol 4 :
3) I looked for an image I liked so I could try and replicate the style, in this case I picked the same colors. The original image is from (http://dribbble.com/shots/1230662-Android-18/attachments/165879) I believe the artist name is Jisoo Kim. LOVE THE IMAGE! :D
The process starts with a sketch, since the reference I was using was male I had to adjust the figure to a more female shape:
Tight Sketch on a second layer with clothes:
Applied some "color doge" on the edges as that is what the original artist might have done, I then added some extra shadow and the pattern on the arms:
Finally Applied another layer on overlay to get an effect of light pouring in at some of the corners. Of course I really rushed through all those steps and I personally think it looked better at the color flats stage but it's fun to experiment!