Looks great!  Very impressive.

If you're using HDRI, I'm surprised that the shadow is so sharp.  Are you
using a light source as well?  If you are, you might consider making it an
area light.

For my own taste, I would either move the camera a little closer or make the
sphere bigger.  But that's just my own opinion.

I'm curious what you mean by "tone-mapping"--I've not heard of that before.

-- Kirk

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