I'd say for someone just starting out those pictures are great. I've seen way worse.
I like that you seem to be encouraging him! Photography is a great gate-way in to art in general.
Only advice that I could give him/you is to not get obsessed with the camera gear itself... it's a very slippery slope. Before you know it, he'll try to justify getting a 2,5k dollar lens because of its "superior optics", "weatherproofing", "superior autofocus" and then next month the most expensive flash etc etc when really all that matters is what he does with the camera, not the camera itself.
I know this, because I've been there myself. Got caught up buying all kinds of fancy shit that really in the end didn't matter that much. With today's technology he can get really, really far without having to invest in super expensive shit.
Really the only ones that have a legit practicable reason to invest in the top-notch stuff are the professionals who have to abuse the living hell out of their systems every single day to make a living.