I think you may have some artifacting going on inside the pepper shaker with that blockiness happening. And the shadow depth might need increasing as the shadows aren't persisting through the glass.

Sidenote: The shader on the sugar dispenser is getting blown out, it does seem less like glass now and the rough super bright highlight makes it look really vague and almost like it doesn't fit in the scene. The coffee stains are a nice touch, but the darker rim on them is a bit harsh and uniformed I think.