I really love your tutorials, but actually fingers don't look like that. The upper segments of the fingers don't bend down, they bend slightly upwards in a flat curve. Also while you name the right measurement in the green area, you don't follow that rule in the part about the bendy bits. And the lower bits of the fingers are not equally bend down in the single parts. segment 1 often has a bigger "belly", while segment 2 has the rounding closer to the end of the finger to make room for the "belly" of segment 1, segment 3 is made of 3 curves, often forming a little "lip" that is important for the grip and to be more flexible when touching things.
I really appreciate that you provide free tutorial sheets, but they should be an accurate reference as well.