17 Refine details
I notice that the character should be affected by the blue background; in particular, the hair should not be pure black. I employ another interesting way to add a blue tone on the character by adding a new layer from Layer> New Adjustment Layer>Levels. In the Properties window of Levels, there are three eyedropper tools on the left side. I click the middle one called ‘Sample in image to set gray point’ and then absorb the warm colour from the illustration. It automatically gives the illustration amazing cold tones.