Great!!
The resume is a wonderful tool for applications, I find. It’s a great way to have just that much more “voice” in the discussion of who your child is. We treat it not like an adult’s resume, but a child’s – meaning “talking” in 1-2 sentences to the adcoms about certain activities that may not stand on their own (like D&D or like one of my kid’s political activities – I didn’t want the adcoms to think that this child would get on campus and wreak havoc with protests etc. Instead I wanted my child to be able to get credit for the amazing work he/she had done while also making sure that child was able to communicate his/her intention, which was ultimately to create community on campus and at the local level, not disrupt things.) Again, the resume is just one more chance for the student to introduce his or herself.
If your child is interested in concept art and development, then perhaps consider encouraging him or her to also pick up some fiction-writing (particularly screenwriting) chops. That skill set will really help.
Other things – history, psychology, philosophy, science – of course also important in world-building and character development!! As I’m sure your family already has discovered!!