Ray Liotta should have lost weight

Ray liotta's face looks abnormally bloated and fat in this movie. He clearly gained weight, but my question is WHY? Frank Sinatra was skin and bones until his very late years, and Ray was already too big to resemble Frank. So why did he gain weight making him look even less like Frank?? It was quite distracting to see puffy faced Ray Liotta trying to be Frank Sinatra.

I like Ray Liotta, but he seriously could have put some more effort in creating a physical resemblance by losing a few pounds. The references to Sinatra being just a "skinny wop" made virtually no sense with Ray Liotta in the role.