Adjusting the light
At the moment the tones are equal throughout the image, and there’s still not enough focus on the centre of my illustration. To fix this, I create a simple black and white gradient, using the silhouette alpha as a mask to radically darken the bottom of my character. It immediately creates a more illustrative look.
Using the Color Range selection I pick up the dark tones, and set the Fuzziness to 150 to capture a better gradient effect. I then copy and paste the selection on another layer, then colour correct it with the Hue & Saturation tool in Colorize mode. I choose cold tones such as blue and greens to colour my shadows. I set this layer to Color Transparency to avoid tone conflicts.