A single fluffy cloud with a shadow beneath.

Single Cloud

Cloud with Shadow

A fluffy cloud with a shadow on the underside.

A horizontal cloud cluster with multiple curves, highlights and shadows.

A wide cloud-shaped, flat-bottomed bush with a curved shadow on it.

A cloud-shaped, flat-bottomed bush with a curved shadow on it. 

A cloud-shaped, flat-bottomed bush with a curved shadow on it.