Looks like an awesome trophy to me! He'll remember that one for the rest of his life I'm positive. Congrats to your boy, he did good. (Obviously your question was posed after the fact LOL).
halfbaked, and others....
I also have a daughter....she just turned 11, and has hunted with me the past 4-5yrs also, though not as much as my son. She hasn't had as much interest. She is no where near ready...in fact, she hasn't even wanted to shoot one herself yet. Much different than my son, he shot his first 6 yrs ago with me. She's been with me when we've shot some....maybe next year she'll be ready. I envision at least 3-4 more years with me before even thinking of letting her go solo.
Also, when I say solo....its on our own private land and I am hunting as well, and we are in contact by radio.