I only use modular with different colors depending on my mood. I want to see the date and time, along with my calendar, the weather and my activity rings. I also added the battery level to keep track of how fast it is draining. As others have said, if I had a photo on my Watch face, it would not work with words on top of it, so the value of owning a "smart watch" would be diminished.
I have several mechanical watches and if I want to see a boring analog face, I can wear one of them. Since buying my Watch, the rest of mine just sit on my dresser collecting dust and I have no desire to make my Watch look like any of them.
TxWatch