Hope Kay got you cleared up last night. I deleted the new third thread you made on this game and added the posts here on the second thread. Best to add anymore questions on the game here on this thread.
Just to add to yout TG2 question:
Yes, the entrance is where you came in.
Based on the stand clue seen at the hallway - This is what should be done:
Turn the first snakes flanking the giant snake head facing the entrance.
Turn the middle snakes to face the water source.
Turn the 2 outside last snakes to face the entrance.
Turn the last middle snake to face the water source.
But looking while facing the giant snake, see that the right side snakes are all in position already. So work only on the left side snakes and the middle back snake.