The black of the candy wrapper blends into the background. If you added some light from behind to create an outline of the candy, that wouldn't be a problem. It would also make the candy glow. They also usually backlight aliens, so it would totally work ; )
Great idea and photograph. Would like if the product stood out a little more (especially along the ends where it disappears into the background) and could have cloned out the bright spots around Saturn
Very good idea! A bit more "3D" feel to your planets would sell this more, but it does look pretty convincing, particularly the earth. (Commenting only.)