The image just comes off a bit flat. Not enough contrast. Perhaps different lighting position to create more shadow or a bit darker frame. Just a bit too many grays in relation to blacks/whites.
Oo, nice. Had to look for several seconds to work out "is it or isn't it?" Great idea. Well framed. Perfect lighting. Great exposures, though miniscule amounts are lost in the shadows. The "fill light" in Rawshooter might bring that out without losing other stuff. Really nice