" It is said that they drink the blood of the victim from them during ceremonies."

Funny, because in trying to figure out what's going on with what appears to be a dead child in restraints, as well as something on the neck, which may or may not be attached to what appears to be an upside-down lamp. Is that a blood-catching device?

To me it looks more like a snake crawling out of sleeve. I don't think it's a container, I think it's a sleeve.
If the container was tilted like this, the contents would spill out.

Oh, I did not know your mom was killed; Im so sorry 😔. Did you see one of those creatures around her when that happened?

I wasn't there when it happened. I got there late, but on the way to her, I could see what was happening there, through the third eye. I have these skills since I was a child. The police then confirmed to me (they started it themselves) that she was ritually murdered. Besides, the cops told me that considering how much blood a normal person has in them, there was only about a third of the total volume, but no dirt. The cop told me bluntly that it looked as if the blood had been taken directly from a bleeding wound.
The first who attacked me was her killer who opened door after ringing the bell and yes, later I saw it there (similar to the picture, without it on the head and a different expression in the "face", a little more elongated muzzle and I felt three claws on the neck not four as in the photo) and it strangled me. In the police file was photos had three claws stamped on my neck (not human fingers). I can retune myself in terms of frequency and vibration, so I survived.