Why does my palm have to face me for the number twelve?
In ASL, the numbers one through five, as well as eleven through fifteen, are traditionally signed with the palm facing the signer when used for counting or stating a general quantity. Keeping the palm inward follows standard ASL numerical grammar.
How many times should I flick my fingers?
Generally, flicking your index and middle fingers two times is perfect. Doing it three times is also completely acceptable, but two crisp, simultaneous flicks are the standard and will be easily understood by fluent signers in everyday conversation.
Should I use my right or left hand?
You should use your dominant hand to sign 'twelve.' While the description notes that either hand can technically be used, relying on your dominant hand for numbers and fingerspelling ensures your signing remains consistent, smooth, and natural.