This chap has achieved good results too...
https://www.youtube.com/watch?v=sHH6WHNoLoI
https://www.youtube.com/watch?v=YdMKQuYXuOw
I suspect the quality of the resin used has a big part in the appearance of the final result.
I note some on YT use a vacuum chamber to ensure all the bubbles are out of the resin.