
It doesn't look anything major.
Perhaps the best advice would but to go to a bodyshop for a quick look over.
The loose screw has probably just poped ou from a speed nut or plastic nut (pennies each), or at worse, snapped a plastic lug on the bumper. Plastic and speed nuts can be replaced, but if it is a plastic lug snapped off, then these can be 'plastic welded' back in place. Any decent bodyshop should be proficient in this kind of work, along with ensuring the correct 'flexible' plastic primer is used on the bumper. I would guess somewhere around £250 to sort that - so it would be a bit daft to claim on the insurance.
One other thing to check though - being as you 'kerbed it' - you would be well advised to thouroughly check your alloy, and also get the wheel alignment checked too. Does the steering wheel still sit level when going straight ahead?
HTH