This is a model i build after thinking how to make a copy of my hand. Then i succeeded in building this, although it has no arm. Just follow the images
Step 1: Make the Fingers
First, lets make the fingers.
Step 2: Make the Palm
Next, make the palm. This model i build puts a little stress on the palm area, so that it shaped trapezium. But, don't worry. The stressed parts are just rubbers. Just follow the pictures and you're done!