YOU SAID:

my head is very big and large and huge

INTO JAPANESE

私の頭はとても大きく、大きく、大きい

BACK INTO ENGLISH

My head is so big, so big, so big.

INTO JAPANESE

頭が大きすぎて、大きすぎて、大きすぎて。

BACK INTO ENGLISH

Your head is too big, too big, too big.

INTO JAPANESE

頭が大きすぎる、大きすぎる、大きすぎる。

BACK INTO ENGLISH

Your head is too big, too big, too big.