If he is very interested in your appearance, but he is also deeply engaged in other ways, then take it as a compliment. If then is only into your looks, then …
Many people find something exhilarating about dating someone particularly smart. They find it easier to respect the person and take them seriously. They find the conversation is more stimulating and engaging. Where it gets complicated is when people also want – or more likely need – other features in their spouse which do not necessarily go hand-in-glove with intellectual brilliance.