"Perfect"isthecorrectspellingfor"完美"inEnglish.Ifyouwanttowrite"非常完美"inEnglish,itcanbetranslatedas"VeryPerfect"or"ExtremelyPerfect".
"Perfect" is the correct spelling for "完美" in English.
If you want to write "非常完美" in English, it can be translated as "Very Perfect" or "Extremely Perfect".