Then two days of waiting and thousands of retweets later, Waduba got exactly what he asked for: his target audience of one, Kevin Hart, acknowledged Waduba's drawing of the American comedian.
The drawing bore a remarkable likeness to the picture of Hart placed side by side, prompting Hart, 39, to say he'd buy the portraits and commission Waduba for three more.
"I see it and I want to purchase it...I also want to support you and your amazing talent by giving you a fee to do a pencil drawing of 3 of my celebrity friends that I can gift it to. DM your info and let's get to work," Hart wrote on Twitter.
For Waduba, it was the culmination of a journey that began many years ago and vindication for all the hard work he has put into his craft.
"I hoped he [Hart] would see it and actually believed he would see it someday," Waduba, 26, told CNN.
"But I did not know it would happen so fast."
"It has been so overwhelming and words cannot describe it. Kevin Hart has always been my favorite comedian.
"We have started the process [of selling the portraits]," he said.
Waduba, a native of Kaduna in Nigeria's northwest, is part of a growing collection of creatives using pencil, charcoal, and oil to produce hyper-realistic art.
In 2016 the hyper-realist community in Lagos, Nigeria's bustling economic capital drew worldwide attention. Oil paintings by the artist Olumide Oresegun were widely shared on social media as many took them to be actual photos.