Did you know that to make a perfect drawing of your hand all you need to be able to do is draw...a square? After a few tries, you'll be an expert in the field!
Small detail: Leave a small space between each half-moon. Look at your hand: you'll notice that your fingers are not stuck together...quite the contrary!
No need to draw your hand's every crease and wrinkle (on the contrary!). On the other hand, it is always a good idea to mark the wrinkles of your thumb, palm and a few phalanges. However, if you are not drawing a close-up of a hand like we are here, then you can easily do without these details which can quickly interfere with your drawing.
Drawing a gorgeous hand will take several hours of practice (along with the feet, they're the hardest things to draw!), so whatever you do, do not give up. After all, you have a pair of models which are always at...hand's reach!