Sketch the fire shape with flowing, upward curves
Block in the darkest base colors first
Add midtones in red, orange, and yellow
Keep the brightest areas near the center and tips
Blend colors softly where flames overlap
Use sharp, irregular edges for flame tongues
Add small highlights with pale yellow or white
Leave some dark background around the fire for contrast
Layer transparent glazes to build glow
Vary flame height, width, and direction
Add smoke or embers if needed
Refine the edges and contrast until the fire looks luminous