In Season 2, a ghoul gets stabbed in the eye and takes out the knife.
In a torture scene, the main protagonist gets his fingers and toes cut off, but all it shows bloody tools. However, no severed fingers or toes are shown.
This show is extremely violent, and it gets even more violent towards end of the season. Don't watch it if you're sensitive to things like human torture and violence. It is bearable if you were able to handle Attack on Titan or Re:Zero.
In the start of Season 1, you see a corpse pressed against a fish tank (the corpse is covered in blood).
Although most of the episodes are very violent and gory, there are some lighter episodes as well.
The anime is about ghouls, which are similar to zombies. They survive through eating the flesh of human beings. However, these ghouls also fight against one another and humans with strong abilities and enforcement, created to combat all ghouls. This had caused the amount of violence to be extremely plentiful.
The opening scene depicts a female ghoul eating the bodies of several people she attacked. A man comes up behind her to stop her, and is presumably a ghoul as well by the bloodshot eyes and the mask he is wearing. There is a lot of blood shown, but the bodies are covered by shadows. Just as the man is about to attack the woman, crystalized blood spikes come between them and she gets away.
A sheet-covered body is shown in the the street, with blood seeping out from underneath the blanket. It is the body of another person killed by a ghoul, presumably the same woman in the beginning.
A boy follows the scent of human flesh and finds another ghoul (1) feeding. It doesn't openly show him eating the body of the human he killed but you can see blood. He offers some to the boy and you hear a tearing noise. Someone (ghoul 2) comes up behind them and kicks the other ghoul (1) in the head. Blood flies and you assume he's been decapitated. A female ghoul (3) enters and her and the 2nd ghoul fight. She cuts him, blood flies, and he runs away.
A ghoul shoves a fistful of flesh into another ghoul's mouth to force him to feed.
A ghoul was stabbed by another ghoul in his stomach, and the attack was relentless as he continuously pierced the ghoul's chest as well and a lot of blood is seen splashing everywhere.
Thinking of nothing regarding someone's privacy, a boy barges into a room without knocking in order to invite the one's inside for an event but discovered that the girl within is feasting on a human's finger. Not much blood is shown here, but the act is really creepy and detailed.