Need Tips Free 3D model

I know the basic know how of rendering but when I see great renders by great engineers I feel so small. For example I can never get that shiny silvery look for metals even if i crack my brain in two into the software, if i give a polished chrome appearance it turns out shiny but dark and not like actual chrome. so i need few tips, whatever you can provide to get great renders in solidworks and also in keyshot 3 if you like. thanks in advance.