Can " 天空一片蔚藍 " also be "一片蔚藍天空"? And translation please? Can " 天空一片蔚藍 " also be  "一片蔚藍天空"? And what's the reason?

Could "天空是一片蔚藍" be correct too?

Also can someone give a good translation? I just translate it as "An azure blue sky". 

I might be over thinking it but I really want to know. Thanks.

Just want to add another thing. Another sentence I encounter is "天空一片蔚藍，很漂亮吧". 

Can we say both "一片蔚藍天空，很漂亮吧" and "天空是一片蔚藍，很漂亮吧"?
天空一片蔚藍 or 天空是一片蔚藍 is sentence, which means The sky is all blue.

一片蔚藍天空 is a phrase, as you said, it means An azure blue sky.