If you have been in a ZOOM meeting you will know people display their image in a variety of ways. Its really a matter of preference.

• Some people want their image to be clear. If thats you, avoid backlight, keep the camera at eye level and be in a well lit room.
• Other people prefer a more subtle image. If thats you, use a darker room and backlight can create a more silhouette view.

• Many people use the mute option. This means any background noise from your place won't be heard by the group. Then if you want to talk, you can unmute. 
• In smaller groups like prayer, people may want to stay unmuted if your background noise is minimal. That enables you to respond easily, even with an amen!