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All of those methods will work. My suggestion is the first one with bits of the others to perfect it.

Here's how I do it. New layer; ctl/cmd click thumbnail of lego; fill selection on new layer (below lego) as noted above (usually with black). Transform the shadow so that it is distorted similarly to the arm. Usually warp and scale do this. Now set it to hardlight (that usually works best for me). Decrease the opacity as needed. Move it around to line up as you want it. Use transform again if necessary.

Once you have done that, you can make another layer below with a very soft brush and paint the edges so they look blurred at the apporpriate places. Remember, closest to the arm and on the arm/wrist, shadow is darker. Make a mask on the original shadow layer, paint in black with a soft low opacity black brush to soften the sharp edges of the shadow. Or as also stated above jut work on the original shadow layer and use the blur tool on the edges. My method is non-destructive; taht is the only difference. Might save time if you screw up and want to make changes easily.

Good luck, post your results.