Hello My Friend @velimir

Let me give this Art another direction ;)

It looks like a skeleton of a some Vertebrate from inside that is most probably the skeleton of a FISH. With black pinching bones of the fins. Actually fish is crying after being caught in hunters hand that is why she is so red inside.

Lets have another look on this Art with my eye :P
This is the most dangerous cell for the insects and known as the Fatal Red Cell. All the criminal insects are brought here to put in this cell for their wrong doings :P
Yes look at the lock of the door that is made by Sir Velimir back in 1663 to punish those insects which cause disturbance while taking the photographs :P :D

Thanks a lot My Friend, hope so you would love my approach towards this Great Art :P

Stay Blessed, Steem On!