Impress the Boss at work...?

Concentrate on your job, do it well and he will be impressed. Your looks don't matter so don't worry. Make your work speak for itself. BTW, you can impress him by working overtime but make sure he knows you are working overtime (you can tell him indirectly by sending a work-related email or something. Don't say it directly. And don't do overtime all the time or he will take you for granted)