Dark

Ever notice that some cams look better then others? 

Why am I writing about this?  You would think this was something that was common sense, but some models don't know how to adjust that.  Any basic rule to photography (or webcamming or this matter) is that your light source should be in front of you at all times. Why do you think cameras have a flash?  So never sit in front of a window.

Something else to consider, what is behind you?  If have a picture or any glass behind you that will reflect the light and cause things to appear darker or cause some kind of glare.  Also if you are using an internal cam the low quality can cause cams to appear darker.

As models you should always be aware of your surrounding areas from how your bedroom looks to what you are wearing on camera.