Not really. A small percentage of the moon's mass disappearing will cause an equally small variation in tides. I'd be much more worried about the tremendous dust storms and tectonic stress kicked up by summoning a hefty meteor to hit the planet. But whatevs. They've got magic, they'll be fine.
Say hello... TO THE MOOOOOOOOOOOOOOON~!!!! *nuke-splosion*
Very nice scene composition and I'm loving the over all feel of the style. I only think princess Celestia's face is a slight-bit askew and that's really the only constructive bit of criticisms I could possibly offer you on this piece because I honestly believe it's the only thing that might've needed improvement. It's comically reaching a 7.0 on the funny-Richter-scale-O. Over all, I'm diggen it bro so, nice work, for-sure. Kudos~ How long did this take you from start to finish, if I may be so bold?
ya~ there still have a lot of skills I need to learn. I am not an artist(yet XD), just a little fan who like drawing. thank you~ and I didn't record how much time I finish this. of course not short time ( I am a lazy people, only drew when i want to drew)