The quality of the image that will be generated. hd creates images with
finer details and greater consistency across the image. This param is only supported for dall-e-3.
The style of the generated images. Must be one of vivid or natural.
Vivid causes the model to lean towards generating hyper-real and dramatic
images. Natural causes the model to produce more natural, less hyper-real
looking images. This param is only supported for dall-e-3.