Why is the word "is" skipped?

I was watching something and someone said this

Interior, Outer Space. A distopian future. The year is 1000. An astronaut floats in. His eyes are average, his face fine.

"His face fine" sounds like it is skipping the word "is", like something a caveman would say. Is this good English or was this a mistake?

"His face is fine" <- that "is" is implied in the previous are.

Consider the following:

His eyes are blue, his hair white and his coat long.

When being poetic, you don't need the remaining is/are, no matter how many are followed by the first one, which already implies itself to the rest of the sentence.

It's a perfectly normal construction, forms of which are found in many languages. It is one form of Ellipsis.