A: What do you think of this?

A: 你觉得这怎么样?

B: It's kind of dead. Maybe you want to add more graphics to jazz it up.

B: 有点闷。也许你可以加点图让它变得生动有趣些。

"jazz (something) up" 是使一件原本可能有点沉闷的事变得有趣些。好比有人在一个冗长的会议里作些说些笑话之类的事, 企图让大家从昏迷中醒来, 就可以说"He tried to jazz the meeting up."。