It's really really hard to determine what colours someone used from photos. You don't know how well the camera captured the colours, you don't know what sort of lighting it was under or if your own monitor is calibrated.
It appears to be some sort of orange-red in the middle, a deep red, a purple (which favours blue over red) and then black.
Out of my own personal paint range, I'd probably do the orange-red by mixing 50/50
GW blood red with
GW blazing orange (this mix MIGHT possibly be close to wild rider red in the new range, but I don't own it so not really sure). The deep red I'd probably use mephiston red. The purple looks a bit like liche purple maybe.
