Most barber shop owners think they are "annoying" their followers if they ask for a booking too often. In reality, your clients are busy, forgetful, and probably overdue for a trim. They aren't looking at your posts to admire the lighting; they are looking to see if you can still make them look sharp. If you don't tell them exactly what to do next, you're just providing free entertainment instead of filling your chair.
Effective social media for barbers isn't about being a photographer; it's about being a local authority. When you share a crisp skin fade or a beard sculpt, the caption needs to bridge the gap between "that looks cool" and "I need to sit in that chair."
Reality check: A post with 500 likes and zero new bookings is a failed post. A post with 10 likes and 2 new appointments is a massive win for your bottom line.