Thanks for all the answers guys!
Well, I wanted to make the whole think look a bit more interesting, that's why I thought to make it spoiled milk, initially I even wanted to make some kind of milk-slime-monster but well, doesn't really fit the rules and probably wasn't a that great idea after all. (or I am not skilled enough to make it look like it were)
The idea behind those smaller ponds was that the glass was in movement before falling, so that a bit escaped the glass as drops before it fall over.
I thought about adding a few "chunks" of milk to make it look less like yogurt but still have to find out how to pixel them.
