You can simply change your watch face utilizing your Apple Watch, however the iPhone gives a bigger display and extra intuitive UI for it. Before altering the Apple Watch face on an iPhone, you have to first add watch faces from the Face Gallery. Here’s the way to do it:

1. Launch the Watch app in your iPhone.
2. Go to Face Gallery by tapping it on the underside menu.
3. Scroll via the Face Gallery and faucet which face you want.
4. Optional: You can change the watch face’s colour within the Color part.
5. Tap Add above the Watch Face’s description

After tapping add, you may see an animation of the watch face shifting away. You now have the watch face within the My Faces part. Now, here is the way to make the face your present watch face:

1. Go to My Watch from the underside menu.
2. Scroll via My Faces, discover the watch face you need, and faucet it.
3. Scroll down the outline and faucet Set as present Watch Face.

It will not provide you with any apparent signal from the Watch app, however it would turn into your present watch face. You can even customise the watch face anytime you need. Just return to the My Faces part, faucet the watch face you need to customise, and fiddle with the Complications part.