The Avro Vulcan entered service with the RAF in 1956 as part of the 'V-force' of Cold-War nuclear deterrent bombers which included the Valiant and Victor.
The earliest load for the Vulcan was the 10-kiloton Blue Danube nuclear gravity bomb, which was quickly replaced by the Violet Club and Yellow Sun Mk 1 and 2 all of which were 400-kiloton weapons.
The Red Beard 25-Kiloton tactical bomb was also employed, but the largest and most specialised load was the Blue Steel stand-off missile which was fitted into modified Vulcans and had a range of 150 miles and a 1.1 megaton warhead.
As the deterrent force was handed to the Navy, the Vulcans were adapted to conventional bombing roles and the standard load was 21 x 1,000lb standard gravity bombs. The only combat missions flown were in 1982 very near the end of the Vulcan's life, during the Falklands/Malvinas war.
This example is a B.2 of 44 Squadron RAF during the 1982 Black Buck missions, carrying 4 x Shrike AGM-45 anti-radar missiles.
I just put it down to that it's a little older there than in the other picture and so the paintwork had been bleached by the sun. I'd say leave it. You probably chose those colours subconsciously for that very reason, that it just looked right.