5)
Extrude the thumb 4 times for the knuckles
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6)
Then mould the thumb into shape. Add more loops as needed.
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7)
Now cut in some loops for the finger bones and split the hand and
thumb to round them out more
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8)
Split the newly created edges at the
end in two (first example). Then cut across them (third example).
Make sure to weld the resulting verts (welded verts circled in red) |

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9)
Refining stage 1.
This one may seem confusing but all we're trying to do is to add
some loops to give the palm some more shape while keeping a usable
loop structure. This means cutting across some existing ones and
reconnect the bad ends.
Mind the cuts hidden on the sides (blue arrows)
What we want is to
turn this
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into this
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10)
After the last step this one's a breeze. Add as many loops as needed
to create all the knuckles, the saggy flesh in between and eventual
folds for when the fingers are curled.
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