Tossing Arm Up Too Long

I've noticed when I serve my tossing arm remains up far too long to the point where my head touches the tossing elbow after I make contact with the ball. How would I solve this issue? I have issues with timing whenever I try to bring the arm down earlier.
 
Note how the server uses the tossing arm to start the cartwheel forward, after the toss the palm goes from facing back/side to facing the net , then propels downward
 
I've noticed when I serve my tossing arm remains up far too long to the point where my head touches the tossing elbow after I make contact with the ball. How would I solve this issue? I have issues with timing whenever I try to bring the arm down earlier.
whta happens when you throw a ball? do you leave your non-throwing arm out there?
 
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