Don't forget sound at the very top. Perfect audio and terrible video is much better than perfect video and terrible audio.

What does Medium refer to in this context?

Agreed. Am I crazy that the "before" looks better and more natural to me? The "after" looks like he is illuminated from the side only in a dungeon.

Same the second one just looks dark.

Here is a tip for white balance. Where possible: try not to sit too close to a large screen or at least maintain a static distance not moving your head much relative to screen. The dynamic changes in blue-ish screen lighting wreak havoc on some skin tones.

One minute I'm Casper and the next I looked like I bathed in Mountain Dew!

Does this mean people don't want to talk to someone under dramatic lighting? So you should go less professional to be more like your audience?