small gap between headlight assembly and body panel

A few weeks ago my 2010 Prius was involved in a minor front end collision. The car has since been repaired. Today I noticed that the passenger side headlight assembly (which was replaced) doesn't seem to fit quite right. There is a small gap between the assembly and the body panel at the most extreme point on the side of the car. Is this just a cosmetic issue, or could water seep in at the location and cause internal damage?