Please do not use blur tool to soften the shadows, because blur tool only make things look blurred. Go for gradient
shading if you want more smooth transitions of colors, use multiple layers. Different colors according to light-set,
play with blending modes. Because right now skin and clothes look really weird. And if you're aiming for simplistic
style of coloring, then do hair like that too, right now I can't say if she's mirajane.
Even if you put lots of time and effort, if you don't know how to get things done with most logic, it'll be
vain. :/
As for lighting, please refer this tutorial by our lovely Alenas http://www.google.co.in/url?q=http://alenas.deviantart.com/art/Basic-Lighting-Tutorial-312058122&sa=U&ved=0ahUKEwiomZvH-dDQAhVD4CYKHY4HBmcQFggLMAA&usg=AFQj
And there are many tutorials out there for coloring, check out nysha's tutorials on dA.
You have potential just need to polish it!