Hey! Good work! To keep shading consistent on a character or any painting, keep the light direction in mind. Whether the light is coming from above, below, behind the character, etc. Sometimes helps with tracing lines that follow the light direction for better understanding and to project better shadow shapes. Having a clear light direction will help prevent you from shading or illuminating everything randomly. Your illustration already has a solid foundation; you mainly need to push the shadows and highlights further to create stronger contrast. For example, if the light is coming from the upper left side, then most of the character’s right side would naturally remain in shadow. From there, you can begin building your graphic shadow shapes. Personally, I like using a Multiply layer to paint the shadow shapes first. You can slightly shift the hue of the colors so the shadows have a bit more color variation instead of feeling flat. After that, you can use something like a Soft Light or Hard Light layer to start painting the illuminated areas. And if the effect feels too intense, you can always lower the opacity and continue painting from there. Once you establish that base, it becomes much easier to continue adding bounce light, midtones, ambient occlusion, and other lighting details. Hope this helps!
