To get the best results for your project, look for these features:

Wide-open eyes suggest surprise, innocence, or fear. Half-closed or sleepy eyes convey relaxation, seduction, or boredom. Eyes with prominent crow's feet (smiling eyes) are used for friendly, approachable designs. Crying eyes with visible tears or red rims appear in mental health awareness graphics or dramatic art.

The "third eye" or "robot eye" tropes rely entirely on PNG assets. Because the background is transparent, a designer can place a mechanical eye directly into a portrait of a human face. Success in this area relies on the Blending Modes (often "Overlay" or "Soft Light") to match the skin texture of the PNG to the underlying image.

A close-up PNG of an eye is a powerful tool for posters. It draws the viewer's gaze. Designers often place typography over the pupil of the eye, using the iris as a natural framing device.

Blue eyes, brown eyes, green eyes, hazel, amber, and even fictional colors (violet, red for vampires or cyborgs) are all searchable. Additionally, medical conditions are represented: eye pngs showing cataracts, conjunctivitis, or heterochromia (two different colored eyes) serve educational and clinical purposes.