How xan i use the creator?
Open Facer - Thousands of FREE watch faces for Apple Watch, Samsung Gear S3, Huawei Watch, and more
Then on the top select what you want to create - the apple of nonapple face.
If Apple - load selection of photos (best resolution - 624x780 px).
On the left, you have a selection of elements in the watch.
If you select an element down below preview a simple menu will popup, click rocket symbol to open the advansted menu of that element.
Also, read as much of Facer Documentation as posible, everything is in there: http://docs.facer.io/