The easiest way to relax the bow hand is the so-called low wrist, see figure 6. The ball of the hand makes full contact with the bow grip.
The wrist is held lower than the hand. In this way, the wrist and the rest of the hand can relax completely. A way to check if the hand is fully relaxed, is to ask another archer to feel the fingers of your bow hand while you are at full draw. It should be easy to bend the fingers.
Advantages of the low wrist are that you can fully relax your wrist and you don't need much wrist strength. A disadvantage is that grasping can occur more easily when the hand is not fully relaxed. The larger contact area also tends to promote bow-torsion if the hand is placed off-axis. See also figure 4.
Another way to position the hand on the grip is with a straight wrist, see figure 7. Now the wrist is at the same level as the hand. Pressure is applied on the area between thumb and index finger. Again, hand and wrist should be as relaxed as possible. It is easier to feel an error in the hand placement with the straight wrist.
This position is fairly consistent, although it requires more strength than the low wrist position and so it is a little harder to maintain over long periods of shooting. The pressure between thumb and index finger pulls them together, closing the hand, and can lead to grasping.