Hand curled in a fist, but with the thumb across the index finger at the end of the curl. All four fingers curled downward, with the thumb across the center of the palm and the upper side of the thumb against the end of the fingers. The thumb and index finger touching, with the other three fingers pointing straight upward. Make the letters at a steady pace. Jerky spelling motions are difficult to read.
Inaccurate letters make for confusion.
Go slowly enough that you can make each letter smoothly and at a regular frequency. Speed will come with practice. Make up additional words. Keep the words at three or four letters at the start. These were the two words that Helen Keller was learning when she discovered the meaning of words.