Tried to get this to look as organic as possible
You could add some rust and hanging wires . And I would add more details to floor, make some parts from the grid
Maybe add moss and weeds. Make it really scary. It’s already scary as it is!
Make the hole super super deep under it with a bit of mysterious features
Most broken bridges dont crumple like it does here, more so it collapses. Maybe make plates and make them look like they are collapsing, instead of crumpling like the foil ball your cats play with.