Dumbo, my sense of it is that the shadow is still too brown. Take a close look at shadows cast on a brown object. Easy for me as we have a brown couch and chair. It is true that shadows are not black except in the darkest situations. But your brown shadow looks unreal.. I agree with dv8 and use that method plus others all the time. Fill the silhouette with black and set it to hard light, then transform, distort and warp the shadows. Consider the light source and indoors, depending on the time of day, windows, walls, etc., there is probably a primary and a secondary light source, maybe a third. I think if you make two that is satisfactory for the most part. If you have one light source, your shadow will have sharper edges but will soften the further it gets from the light.
Depending on the angle, it will be a short, fat shadow or elongated. Elongated shadows tend to have softer edges as they get further out from the direct casting below the object.When you have an object held high like the lego, it will be lighter than you have it. From the lighting highlights and shadows on the arm, you can see that it is directed more leftward than your current representation, angled more clockwise. Using the hard light blend with the right opacity will give it the shadow grey cast plus the brown. You are right about that, the shadow is not black or grey. But currently, it looks deeper that the brown of the ottoman.
You may want to select the footrest and darken the levels to bring out more detail and better color. Also, the lego piece is rotated away from the light source. The highlight is questionable. What is the light source for the brilliant highlight on the grey? That too can be fixed. And, you will need to create a shadow on a layer above, to make shadows around the yellow form which is away from the light, as well as on the side of the grey piece which is resting on his hand. There should be dark shadow on the fingers and the edge of the lego piece which is furthest from the light hitting it on the top and the forward portion of the piece.
Those are my observances.