I think the eyes are trails of clear glass on the surface. In one of the pics, I can see through one of them, although there appears to be some amber that "appears" in it, not unlike the fire of opalescent glass.
Are there any colours or opaque areas in it?
It looks, sometimes, and perhaps under different lighting conditions, to be a little bit similar to some pieces by Pavel Hlava for Skrodlovice (although one of mine is marked Ceska)
But those have applied blobs of glass, with Silver Nitrate effects on them.
I have two of those and the applied blobs do that "firey" thing, but I think that is related to the silver that gets into them.
The pieces are a similar colour, which is created with a very thin layer of deep cobalt blue glass inside very thick casings of clear.
I'll find a link to some images of these bits for you.
Found a thread with a few of the Skrodlovice pieces I'm talking about.
https://www.glassmessages.com/index.php/topic,57884.0.htmlI just wondered if these might be related, in some way, to your bowl.

I am otherwise totally clueless.
