Oh yes, turning sideway and having your left hand pointing to the ball. The other trick to remember is to anchor your right foot (presumably your are righty) behind for balancing and propelling your body outward. Don't try to swing hard / snapping onto the ball, just having a natural swing toward the down coming ball, and turn your right shoulder out and make step your right foot forward will be fine. As slowing down your swing to ensure for an accurate and clean hit, by turning your shoulder and propelling your upper body from your right foot will definitely giving you the power.
Smash Technique +
Let’s start with the grip. The chopper grip is normally used when you hit a smash because it helps you hit the ball with maximum power. If you’re a beginner it might be easier to start with a forehand grip but you should aim to change to the chopper grip as soon as you can.
When you hit a smash you should always be sideways on and slightly behind the ball. Moving into the right position is the most important thing to do to hit a great smash. When your opponent hits a lob you’ll probably be at the net or moving towards the net so you need to move to the point where the ball will fall taking sideways steps and always keeping your eye on the ball.
As you move across the court, draw the racquet back behind you using a similar action to that of the serve except the backswing will be a little shorter. You may find it helpful to point at the ball with your free hand, this will help you focus on the position of the ball and make an accurate contact. Reach up and swing through the ball at full reach with as much power as possible but make sure you stay in control. As your racquet arm swings through your free arm swings down and alongside your body, this will provide additional balance and power.
You should aim to hit your smash away from your opponent, maybe into the corners or across court. If you hit a great smash then you should win the point but you must be prepared for your smash to be returned by your opponent so make sure you recover quickly by either moving back into the net or back towards the baseline so you’re ready to play your next shot.