Apple Watch Mickey Mouse face wont show on watch.

If other screen functions look OK there is no fault in the hardware, the problem is almost certainly settings. I would try the following sequence of fix attempts:

• Forced reboot your Apple Watch. Simply press and hold (together) the Digital Crown and Side button, until the Apple logo appears.
• Remove the Mickey watch face from the watch, then reload it from Face Gallery.

Update: I just found this thread, https://discussions.apple.com/thread/253224664

If you have Apple Watch Series 6 it looks like a possible bug. Use https://www.apple.com/feedback/ to report the problem.

Blue Box? I have no idea unless it is the screen responding to your touch.. If it works and talks, don't worry about it!