I really love this peice, especially your amazing drawing ability. The flowers are very vibrate and eye-catching, and nicely detailed, too! I am always amazed by your anatomy, and to me, that all looks great.
As for colouring, I'm not so much of an expert to really say much, but maybe more dynamic shading? The skin looks a bit plain from afar, though you can see some dimension when you look closely. I would suggest to try and make the shadows darker-- same with the clothing at the bottom.
It really is great, though, and I hope you upload more! I'm still waiting for that coloured picture for your Silent Hill project, js.