I will try to make a more intelligent contribution this time.
Wobby, there is much nonsense talked about hand positions for pianists. The ‘correct’ one is the one that is right for the individual.
Watch professional pianists and you will see: curved fingers; flat fingers; high wrist; low wrist; level wrist; any conceivable combination of the previous; long fingers looking like spiders' legs; short stubby fingers; long fingers moving a lot; long fingers appearing to hardly move at all; short stubby fingers moving a lot....; loads of finger movement but little body movement; loads of body movement but apparently little finger movement; any conceivable conbination of this whole paragraph + anything else anybody else has to offer.
The one thing they have in common is an attempt to avoid unnecessary muscle tension.
To get the idea, try this: sit at the piano and place your right hand on the keyboard. Your upper arm will do most of the work supporting the weight of your arm. Your elbow and wrist will be working sufficiently hard only to prevent your hand from collapsing under the weight of your forearm. Assuming they are relaxed, your fingers will be resting lightly on the keys in your ideal hand position. Your elbow should be slightly in front of your torso; you are sitting too close if it is at the side of your torso.
Now gently put an extra curve on your index finger and hold that position. You will feel extra, unwanted tension gradually creep into your hand through the muscle of your index finger. The same will happen if you flatten a finger out of its relaxed position.
Give your hand a shake to relax it again, then replace it on the keyboard as I described earlier.
Play a note with your middle finger and hold it down, using only sufficient weight to keep it depressed. Experiment with lightening the weight until your finger almost reaches the point where the key will rise. That is a perfect example of using just enough muscle power to depress a key with as little unwanted muscle tension as possible.
To feel the opposite, go to extremes. Press down on the note with all the finger power you have, and really work to keep the note down using as much pressure as possible. Your other fingers may well have shot upwards and are as tense as can be. The tension will shoot up through your hand, up your arm and into your shoulders.
Try to keep your muscles as relaxed as possible when you play. Maintain the hand position you achieved earlier and your tone will benefit hugely. You also set up the conditions whereby you acquire facility and dexterity more easily.