How many bestiary entries are there in Witcher 3

There are definitely repercussions.

I looted some things in the military camp near the first village, wanting to see if there were any repercussions (keeping in mind I did it in plain sight) and I promptly got my arse handed to me by the entire encampment.

They took some cash from my pockets and rather than reloading from last save, I 'woke up' in the encampment (sort've like how dying in GTA and other games works) and they weren't aggressive towards me any more.

Well there is no Witcher 3 Functionality for Screenshots.

But Yes you can easily take screenshots of The Witcher 3.

I take screenshots of games in 2 ways.

Steam Way

If you are playing Witcher 3 on Steam you can press F12 to take a screenshot while you are playing.

NOTE: This was the default key that came with my installation. You can change it in the settings.

If you have it on GoG you can open it as a non-steam game in steam and still use the functionality.

MSI Afterbuner Way

The second option for me is using MSI Afterburner.

To enable screenshots you can:

1. Open MSI Afterburner
2. Go to Settings
3. Open tab "Screen Capture"
4. Set Default Key and desired folder for the shots
5. Open game and take screenshots at will

With MSI the advantage is that you can even choose the extension of the images generated.

Hope I helped