There's a few things on the default face that I would like to suggest someone change.
First, the time. It's been a long standing tradition that you insert a colon (:) between the hour and minute. (hh:mm).
Failing that, please take a cue from the Forerunner watch and make the hour BOLD (hhmm) so it stands out a little better.
Second: I don't want the provided three icons for stairs, steps, and minutes displayed. I live in a pretty flat world and will never care about stairs. Just a lot of wasted space. Might be nice if you provided a couple options. You don't have to provide all the options, but just try to keep to things that people might be more interested in and not subject to a lifestyle. Some people live in ranch houses but everyone has things like steps, heart rate, stress levels, etc.