Some of your own shots have a white haze over them… was that intentional? It appears as though you over-adjusted the ‘blacks’ in post.
Otherwise, I like a great deal of them, especially the cute “kids” shot.
As for your friend, many look over-saturated, straight out-of-camera. You might suggest she / he wander from their comfort zone into unchartered territory – perhaps trying ‘incorrect’ camera settings with candids, off-camera flash, deliberately de-saturated colors, maybe using the ‘wrong’ white balance – all to challenge themselves to see other ways they could make a photo ‘work’ either with composition, focus, lighting, whatever, when met with the challenge of those changing conditions. They may be surprised.