God gave him clear instructions how to make this device, so we can be sure he "looked at it" but it somehow failed to work as he never saw the Promised Land because he died instead.
"Fiery serpent" - Life giver? Healing device?
And what have hooded cobra got in common with biblical accounts of "fiery serpents"? I thought their venom was toxic so surely you are not suggesting, as your choice of these two images seems to imply, that "everyone that is bitten .... shall live."
Cardiovascular collapse, coma, paralysis and respiratory failure leading to death ... that's not my idea of "living".