Now let us weld vertices, keep in mind and try to give a rounder shape as this will keep the topology smoother. Once again do the same thing by select ring finger and shift dragging to create a duplicate with clone as element option selected and then we have to match it with the reference image and this would be the pinky finger.

Now let us target weld each vertex and if it does not weld properly create new segments were ever necessary.

Ok, as of now we have finished modeling the four fingers and now we need to model the thumb. Thumb cannot be created by duplicating other finger as it is totally different. Now let us select border polygon face of palm and extrude it as shown below.