You seem to pull more to the left which means you're muscling the trigger or you have too much in the trigger guard. I, personally, just use the finger pad or finger tip like a rifle. It gives better control and gets all that excess finger out of the way. When this happens, you could be curling your finger to pull the trigger. Like I mentioned before, slowly pulling the trigger to the rear with less finger can help this. The shot should almost surprise you each time. As you get better, you'll find your "wall" (the end of the trigger's slack) and from there you'll know when its ready to fire.

Also, once the trigger is pull, hold it until you your sights realign with the target. Then slowly realse the trigger and you'll feel and hear an audible click. That's your trigger resetting. From that click, you can start your trigger squeeze again.

Hope this helps! Dry fire and practice that trigger squeeze as someone else mentioned.