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I forgot to take into consideration to take a sample from the photo's shadow... lol...

tweak a bit more to bring out a bit of shadow by fingers and make the lego's shadow narrower. Delete where needed at the hand area.

Now I must say that light has a peculiar way of throwing shadows based on an object's shape, distance from the main light source and distance from the surface where a shadow is cast and whatever ambient light source there may be.

You may have to create 2 layers of shadows one with more blur on the edges and the other with less blur.

The shadow spreads along the edges.  Use the arms shadow as your basis of how the Lego arm's shadow will be. It is not the perfect shape of the piece rather it should be a bit distorted. You may have to lower the opacity of the lego shadow more as well as thin out the shadow at the ends (lego shoulder and hand) with a large size eraser tool set at airbrush low pressure.