From Sonic Retro
Kojichao is one of the most respected artists in the scene and was previously hired to draw Sonic art for game magazines almost indistinguishable from the original style. Also did much of the graphic design for Sonic CulT.
Also an oldbie of the Sonic Community, dating back to the original Area 51.
She now works for a video game company in Alberta, Canada.
Her art can be found at: http://kojichan.deviantart.com/
Her personal website, including her newer work, can be found at: http://kojichan.neosouthisland.com/