Focus on the behavioral traits of being a photographer rather than your skillset. Good photography isn't about being an expert with gear, settings, and Photoshop. Good photography is ultimately about capturing images that fulfill the goal of a project.

This is another question that speaks to the importance of researching the agency. Understanding the kind of work they create will give you insight into what they consider "good photography," which you can use to tailor your answer. Many interviewees will want to talk about how knowledgeable they are of gear and software because they think that is what makes a good photographer. However, it isn't always about being incredibly creative; it is about delivering images that fulfill the goals outlined by the client.

A good photographer asks questions and focuses on the goals of their client. Photography should be purposeful and thoughtful. A strong skillset and creative ideas are important, but it is ultimately about delivering images that speak to a client's needs.