I’m pretty sure it’s a computer render
Airfix box art is always a painting: the originals were by Roy Cross.
More recently I think they are all computer art, generated from the CAD data used to produce the tooling, rather than brush painted.
The Typhoon is a bit over detailed, a real typhoon doesn't have such pronounced surface detail.
This IWM colour photo taken from Wiki shows the real thing.
Much less surface detail is visible.
As a maker of aircraft models I have a real issue with models that have been over surface detailed. My view is that the model should look as the real thing would look if viewed from a distance so that they appear the same size.
This is a view of a Meteor, undergoing restoration. Compared with the Typhoon box art almost no panel or other surface detail is visible....
The 4 red lugs are all that hold the rear fuselage to the centre section and wings...!