Too cute! I love how you put Rainbow Dash and Princess Luna into your illustration. It makes sense that Luna would be there too considering that she's the Princess of the night. Everyone's expression looks great in your piece! I especially love Luna's expression :3
I want to leave a decent comment on this that's something beyond "Wow, this is so great" but I'm having trouble picking out specific parts to compliment because it's ALL good. So...um...wow, this is so great!