Never use bungie cords to hold down your tree.
This is also shitty tied tree.
Get rope or heavy twine and wrap around the base.
Best option: have the guy on the lot do it. He'll tie more trees in a day than you'll do in a lifetime.
Also, measure your ceiling and area with a tape measure. Don't tell me you're looking for a 6 foot tree and hold you arm 8 feet in the air.
edit: Also then cross over the back of the tree, (as in photo 2, but have the ropes tighter) to prevent the tree from going side to side.