Dr. shared no pictures of his work at consult. Is this a red flag?

It is a bit unusual especially in this age of social media to not offer before/after photos but I wouldn't say it's a deal breaker. It seems you were impressed with this surgeon in all other ways. See if he has a chance to "dig some up" and see what you think from there.

Your concern is understandable, but no pictures are not a deal breaker.
If you researched the doctor's credentials, reviews, employment history and have no concerns from those then it is probably OK. I certainly would ask the doctor to provide some referrals from previous patients that you can talk to directly.

Although not at all common, some practices are not really set up for photographic documentation. This might be due to the practice situation. For instance, some hospital based and academic practices and the HIPAA requirements can be challenging. Many practices are a blend of reconstructive and cosmetic and do not have the resources nor are they geared toward patient flow that is conducive to photography.

Finally, a quick word about pre/post photos in general. They may not tell the whole story Almost all surgeons who post photos of their work are going to use their best results. It is just human nature. Also pay attention to the technique of the photographs. As an avid photography enthusiast, I can tell you that you can hide a lot or enhance certain aspects of a result by manipulating the patient's stance, the lighting, use of makeup etc. Pay close attention to the nuances of the photos.

I hope this helps.