I just got my watch to update to watchOS 2, and I sent a sketch to my girlfriend afterwards, and when she received it, it was sent from my iCloud email, not my phone number like it used to. In the iMessages setting, I only have my phone number to send and receive to. Tried digging through all the Apple Watch settings on the watch and on the app. Everything seems normal. Don't know why it won't send via my phone number like it used to so when she receives a sketch, she gets my full contact.