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From what I see in your file, you have 2 problems.

First it would have been better to create a duplicate of the lego arm, fill with black, apply gaussian blur and lower the layer opacity. after which you position it and warp a bit to suit the shadow angle.

Second is the lego hand.The shadow should have a grasping C shape. This will need a bit of imagination. rather than have a solid fist shadow, you have to shape the hand as if you were viewing it from above.