Awww, he is adorable! Congrats on your new baby!
I like the name Chester, My good friend had an awesome dog named Chester!
I think Candy is right and your little guys color will change over in a few months once you get him on a good diet. Then you will see his true coloring.
For Black beauty traits/markings, they will have darker overall fur coat, darker patagium, black knuckles, dark facial markings(chin straps and muzzle) and a grey tummy(underside)instead of creamy white.