On the Watch, the background of Digital Touch messages is black. This makes sense because the background of most things on the Apple Watch is black, so when you open it in Messages it looks as if it is embedded in your message thread. But in Messages, it can look big and in the way. It would be great if the drawings, etc. that you send had a transparent background so that it simply matches whichever background it's on, making it fit right into whichever device that it is viewed on. After all, every other device uses a white background!
What do you think?
TL;DR: Apple should make the background of Digital Touch messages transparent so the message rests in seamlessly on whichever device opens the message. (Apple Watch: Black background, Everything else: White)