From 2009 to 2014 I've been able to enjoy driving the design process for each of hOme's watch models:
A typical process started with moodboards I submited to our watch designer, often accompanied by a basic 2D drawing giving him a good idea of what we were looking for.
The two of us then alternated between half-days workshops and time spent on our own to figure out how each part would look.
When the 3D model was complete, I usually redesigned the dial and hands so they would fit the rest of the watch perfectly.
It also helps working with a designer who's field of expertise extends far beyond watches. His name is Jérôme, go take a look at his work.