PLEASE HELP - Enhance mug reflections

Hello I am hoping someone can help me!!

I am new to photoshop and slowly learning of which I am enjoying. I have download a mug mockup that I liked because it looked shiny and I love the reflections of light on the mug.

My question is, is there a way to enhance these and make the mug look more shiny? If I overlay a mug design and use MULTIPY to blend, it kind of looks unrealistic to me and does not have the 'Real Life'  effect that I am looking for.