Your grouping looks good for a beginner. Repition is everything, anchor point, peep to sight ring, and releasing. A comfortable anchor point is important, one you can go to exactly the same every time without thinking about. Another thing is how you see the sight ring through your peep, the position of your sight ring in your sight can change pin location. Your release hand should go straight back when releasing and your bow should fall straight forward and you should be able to watch the arrow flight. Muscle memory and consistancy only comes with shooting time. Your already hooked, it will only get better from here. Have fun and shoot as much as you can.