Now the artwork, which gained top marks from Stuart's students at Smestow School in Castlecroft, has gone into an online raffle to raise money for the Wolves Foundation's Feed Our Pack project.
Nuno has given his approval and added his signature which is expected to boost donations.
He said: "Families and chidren have been made more vulnerable because of the pandemic and we have to help them.
"We have to give them hope for the future."
The Wolves charity aims to help reduce the effects of food poverty and support residents of Wolverhampton who have been affected by the Covid-19 pandemic.
Stuart, aged 45, said that he had painted the portrait of Wolves legend with "the intention of not only inspiring his students and honouring his hero, but also to help the local community through the charity".
He said: "During lockdown, Premiership football and art have been two interests that have given my students and myself a lot of joy.
"As a lifelong Wolves supporter, I wanted to give back, not only to my team but also the local community."
He is hoping the painting, which measures about three feet 6 inches square will eventually go on public display.
"I was delighted when Nuno offered to sign the painting."
Executive head teacher Clive Jones said: "We are proud to be working together with the Wolves Foundation for such a worthy cause.
"Nuno himself has added his autograph to the portrait and the fundraiser is now open.
"Every £5 donated to our JustGiving page is one entry with every penny raised helping the local community who have been affected by the pandemic.
"Stuart is a fantastic artist and I look forward to working with the Wolves Foundation further on other projects."