Looking closer at the photo it's even starting to strip the paint off around the edge of the wheel arch... you definitely want to do something about that immediately... I assume the other marks are just water mixed with sand - if not the entire paint finish looks like it's screwed!
Good luck!!!
I’m going to guess it’s just a mixture of dirt and debris.
Hopefully the 0-60’s haven’t thrown too much dirt into the paint.
The car looked like it came with mudflaps (in the boot). They might be simple extensions or hopefully rear flaps.
I’ll get them on ASAP and see about this PPF. After getting this damage repaired...