Well I was going to do some visual edits to it, but whenever I try colouring over it, the colours have like a dark grey tint, what filetype did you save it as ? I wasn't checking o.O
But as I said, not enough contrast, everything seems too straight, where is your lightsource coming from too ? Cause I see it on the right of the body, but top of the head and arms o.O
And remember;
Light tones should be tinted yellow
Dark tones should be tinted blue