My 9/yo has 5 trips under his belt. He loves it, every day has been open to close with a 20m lunch break. He's done 2 lessons to get him going, definitely time for more, but to be honest now that he's all over the mountain I've been having too much fun to press them.
Being a skier I'm not really sure what is good or bad form outside of flailing arms. The obvious thing right now is he totally favors heel, so basically goes down and does 180s to keep turning. Of course he's not really listening to the old man who skis and doesn't snowboard when I try to get him practicing toe. (Hence the need for lessons because the instructors are godlike compared to my advice).
Anything else obvious that jumps out?
Awesomecool101 snowboard4 - YouTube