Impressed by his son’s work on the breaker panel, but unsure about the next steps – any advice?

I had a proud dad moment recently when my 14-year-old son tackled hooking up the breaker panel in one of our tiny houses. I must say, he didn’t do too shabby for his age and it being his first time doing it solo. I had to offer him some guidance here and there, but overall, I think he did a pretty good job. We just need to grab a few new breakers that actually fit and work in the box, as he did his best with what we had on hand. Let me know if you notice anything that could be improved, as he’s convinced I’m just being tough on him because he’s my son.