Jean,
I would work on the mom's hand and make sure that
the fingers are anatomically correct (the ring finger and pinky in particular looks funky), before building them up further through the use of color.
Study your own hand first and observe how the nuckles are slightly wider and how the fingers taper as they get closer to the fingertips. Fingers that are stretched still have little bumps and protrusions that will reflect or cast slight shadows.
Hands can be a challenge, but they can add so much to a painting, when successfully rendered. Have fun!
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