If you want a fast, practical approach for coloring Astrid fanart that still looks polished, try this compact workflow I use when I’m short on time. Start by doing clean flats: separate layers or layer groups for skin, hair, clothing, and metal. Lock transparency on each flat layer so you can paint inside shapes without worrying about overflow.
For lighting, pick one or two light sources and place shadows using a Multiply layer — think about where straps or her braid would cast darker shapes. Then add midtone richness by painting over with a low-opacity brush and a color slightly different from the shadow (a cool shadow, warm midtone usually looks great). Use Overlay or Soft Light layers for the main warm highlights and a small Color Dodge for intense rim light if she’s backlit. For eyes and small metallic details, use a tiny hard brush for crisp specular highlights.
Finally, group everything and apply subtle color grading: a curves adjustment for contrast, maybe a gradient map to harmonize colors, and a tiny bit of noise or paper texture. Shortcuts that
save me time: custom brushes for hair strands, clipping masks for quick recolors, and layer comps or versions so I can revert. It’s surprisingly satisfying watching flats turn into a vibrant portrait with just these few focused steps.