Sketch the main smoke shape with light, loose, wavy lines
Start from the source and let the lines rise and curl upward
Vary the thickness of the smoke strands
Add soft spirals, loops, and drifting edges
Keep the outer edges irregular and uneven
Layer multiple wisps to create depth
Darken the densest areas near the source
Fade the smoke as it moves away
Use light shading to show volume
Blend the shading smoothly
Leave some areas blank for highlights
Erase or soften hard edges
Add smaller wisps breaking off from the main shape
Adjust the flow so it looks natural and airy