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1 September 2015 Last updated at 17:31 BST
Alister Colley, who has a studio in Pateley Bridge near Harrogate, said to hear he had won was "almost unbelievable".
The title means he has become the most sought-after and collected artist in the country.
Colley said creating the official picture for the Grand Depart had put him on "a whole new international platform".
He has now been asked to be official artist for next year's Grand Depart.

A roof will be placed on the tank, which will hold more than 60,000 cubic metres of gas.
The work is being done by the plant's owner Ineos to hold imported shale gas from the US, obtained through the controversial fracking process.
The development of unconventional gas extraction has been halted by a Scottish government moratorium.
Ineos announced plans last year to invest up to Â£640m in shale gas exploration in the UK and use it as a raw material for its chemicals plants.
The company hopes they will eventually be able to use gas that has been fracked locally in future rather than relying on stocks from the US.
The new storage tank is 56m (183ft) in diameter and 44m (144ft) high - 560 double decker buses could fit inside its 108,372 cubic metre interior.
The 330 tonne roof of the tank was lifted into place using a cushion of air similar to a hovercraft.
John McNally, chief executive of Ineos Olefins and Polymers UK, said it was a "landmark day for Grangemouth".
He said: "We know that US ethane has transformed US manufacturing and now Scottish industry will benefit as well.
"This will secure a cost-effective supply of ethane for the next 15 years, and give a sustainable base for Grangemouth for that time."
Ineos has They have started a community consultation process to try to win support for fracking.
The firm said it was unconcerned about the moratorium and a spokesman promised to drink "a lot of tea in a lot of village halls" to try to win the argument.
However, Friends of the Earth Scotland director Dr Richard Dixon said: "We strongly suspect Ineos' plans for fracking in Scotland would result in blighted communities, with planning permissions sitting unused for years.
"The last thing anyone wants is to have a site next to their home where fracking may happen at some unspecified time in the future.
"Communities could have to wait until nearly 2030 to find out if they are going to be fracked or not.  This threat of blight is another good reason for the Scottish government to decide that fracking has no place in Scotland."

Joseph Keighley, 42, was a full-time firefighter with Essex Fire and Rescue Service and based in Basildon.
An independent fire service report found no evidence bullying contributed to his death in July.
His twin Jeffrey said Joseph had told him he was being bullied. An inquest in Chelmsford recorded a verdict of suicide.
The inquest heard Joseph Keighley had left a note in which he said: "I am sorry to all but I can't carry on in this life.  It's too hard, too tough."
A wider investigation into an alleged 'intimidatory culture' at Essex Fire and Rescue is under way.
An artist who painted the official picture for the Tour de France's Grand Depart from Yorkshire in 2014 has won the accolade of Best-selling Published Artist 2015.
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Work to complete the biggest shale gas tank in Europe is continuing at the petrochemical plant in Grangemouth.
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The twin brother of a firefighter says he complained of bullying at work in the weeks before he killed himself.