Now let us select the edge of the finger and ring it and then add one segment right there, as it will help in animating the mesh.

As we have finished modeling a finger, you don not need to model other four fingers, as you simply duplicate the geometry of the already modeled finger and then you can tweak with such that it matches perfectly with the reference image. To duplicate the finger object we have to select polygon faces of the finger as shown below.

Hold down the shift key and drag it, then you will be asked whether you want to clone it as object or clone it as element, just check the "Clone as Element” and click ok as shown below.