Well, here's my take on it. The photos are ok, but they aren't really much more than sharp and well exposed. You didn't pose them or anything, right? Natural light? The background is what it is, but with that much DOF it looks - unprofessional. To charge, for such work, is disingenuous, if you ask me. But if they are willing to pay it, because they want good, sharp images of their participation versus smartphone pics, then you have met a need.