Learn Spanish (Latin America): El pájaro de hielo quedó muy transparente. - The ice bird turned out very transparent.

You would ask: ¿Qué tan transparente quedó el pájaro de hielo? The interrogative phrase qué tan is followed directly by the adjective (transparente) to ask about the degree or extent of that quality.

Why does the translation use "turned out" for quedó? I thought quedar meant "to stay".

While quedar often means "to stay" or "to be located", at the B2 level you will frequently see it used to express a final result or outcome. When talking about the end result of a process, like sculpting an ice bird, it naturally translates to "to turn out" or "to end up".

Could I just use estuvo instead of quedó here?

You could use estuvo, which would simply mean the ice bird "was" very transparent. However, quedó is much more precise and natural here because it specifically highlights the result of how it was made or transformed.

Why is it pájaro de hielo instead of using an adjective like helado?

In English, nouns often act directly as adjectives, like the word "ice" in "ice bird". In Spanish, to describe what an object is made of, you must use de plus the noun. If you used the adjective helado, it would mean a frozen bird, rather than a bird made entirely of ice.