According to the AI I consulted, Here’s how I identified it:

• White eye-ring: The most distinctive feature is the prominent white ring around the eye.
• Yellowish-green plumage: The overall color of the bird is a yellowish-green, typical of white-eyes.
• Small size: White-eyes are small birds, and this one appears to be consistent with their size.  
• Location: Japanese White-eyes are common in Hawaii, where you took the photograph.  

While other white-eye species exist in Hawaii, the Japanese White-eye is the most widespread and abundant.