I recommend looking at the letter "I" in "LIBERTY". To me it's the biggest tell for whether or not a PRF 1964 Half is an accented hair variety. Also this image from PCGS Coinfacts should help: Btw is that 1964 a PRF? Only the PRF's have the variety.
based on the pic you posted, this is NOT Accent Hair in my opinion. Compare image below to your coin: also, I am not sure your coin is even a proof.