This abstract began as a free-form pencil sketch. A shape with three protrusions reminded me of a hand. I masked out a hand shape in front of the three-fingered one. Then I sketched in the missing two fingers of the partially hidden hand. This was difficult. The thumb and first two fingers face the viewer; the other two fingers are obscured by the other fingers of that hand and the overlapping hand.
Finally, I added the shadow of the white hand.