When is violence NSFW?

I need a little help to rate these three sheets:

https://i.imgur.com/aojctRf.png
https://i.imgur.com/MrgiLfP.png
https://i.imgur.com/3nIZO5L.png

- Two dead people and one person swinging the axe.
- Only blood is seen, no wounds, intestines or other intensive gore.