The Google Camera App has received an update with a useful feature that you can take advantage of with your Android Wear Smartwatch. The update adds the functionality for your Smartwatch to act as a remote trigger for the camera.
Once the Google Camera App is launched on your phone you receive a notification on your watch, and can then use it to capture photos wirelessly.
If you have auto update enabled it should update for you, or you could visit the Google Play link and and do it manually.
Download/Update Google Play Camera here.