How long was your screen on?

 

I couldn't see your first two pics, but the 3rd one doesn't look out of the ordinary. It looks like a what it would for a moderate to slightly heavy user. THe screen on the GNex is huge, and has tons of pixels. Its just going to drain fast when you have it on. The losing 20% on airplane mode is another story, that shouldn't happen, I wish I could see the pics for that.

 

You'll have to repost those other pics. We'd need to see the screen on time, the details of the android OS usage, and also the details of the usage graph.

Without seeing that, we can only guess. Screen use being so high leads me to believe there was extended screen on time and your brightness is probably cranked up. But again, its just a guess.

I agree, the 20% drop in airplane mode is strange unless the screen was on. I have seen some complaints of people whose phone screens come on by themselves with no contact.... so that's possible.

 

Download Better Battery Stats to see if you are having issues with partial wakelocks. Be sure to read the entire original post (link for download is in it) for instructions, about wakelocks, and possibly peruse the thread for more detailed information.

There's two versions of the app. One linked in the thread from the developers website (free version), and the other link is for the paid version at Google Play.

[APP] [04 Aug - V1.9.2.1] BetterBatteryStats adds battery history back to Android - xda-developers