Lightly sketch the cloud shape with soft, rounded curves
Use overlapping circular forms to build volume
Vary the size of the bumps and edges
Keep the bottom flatter than the top
Add smaller cloud forms around the main shape
Shade the underside more darkly
Leave highlights on the upper and outer areas
Blend the shading softly for a fluffy look
Add subtle edge details to avoid a stiff outline
Erase or soften hard lines
Repeat with different shapes for variety
Add sky or background shading if needed