A portrait prompt shown with its result — copy it, swap the subject, run your own.
Prompt
a {argument name="bird species" default="dodo bird"}. Its body is plump and rounded, covered in {argument name="feather colors" default="dark gray and brown feathers"} with lighter, intricate patterns. The bird's legs and feet are visible, with scaly skin and sharp claws. The head is a lighter gray, with a prominent, curved beak that has a {argument name="beak texture" default="cracked texture"}.
The prompt is mostly a plain-language scene description. That makes it a flexible base: add a focal length, a light direction and an aspect ratio and it will land the same way on every run.