Start with the silhouette
Fire can erase structure. A convincing creature therefore needs a readable body before glow, sparks and smoke are added. Long primary feathers, a hooked beak and a clear tail rhythm keep the bird legible even when effects fill the frame.
Value design matters more than colour saturation. Dark feather masses give bright edges something to illuminate. If every surface is equally orange, the creature becomes a flat light source rather than a body with weight.
Give the heat a material logic
Artists can decide where energy originates: under the sternum, along feather shafts, at damaged edges or in the wake of movement. That decision creates consistency across idle poses, attacks and recovery. It also helps animation teams avoid unrelated effects competing for attention.
Motion should reveal temperament. Fast sparks suggest volatility; slow rising embers can feel ceremonial. A tail that leaves calligraphic arcs reads differently from smoke pushed by turbulent wind. The best effect supports character and scene, not just spectacle.