You may want to edit your slingshots motion a bit so that it fits better with the perspective of your picture, and also add a few extra keyframes on the stones motion tween so that its arc of motion stays congruent with the position of the snapping sling.
If you want to see how the entire thing looks with all of the motion, even motion that should only be visible when triggered, then take a look at this. Without the triggered motion, though, the game looks like this: in play-ready state, and just needing the ActionScripts were going to add in the next lesson to make it respond.


