please they could do a tutorial, that way achieve much reality? my renders are well ugly :(
Just a small tip if I may :)
Reflections tend to help most with presenting metallic objects. If your scene is covered in white lights and backgrounds then reflections will probably be duller and weirder...
Theres lot's of tutorials / courses online that touch this particular topic, try checking some of those out perhaps :)
But uhm yeah, Rawalanche hit the nail on the head :D