Stereo Review deemed the album "a treat," writing that it "benefits from the mellow horn arrangements of Hank Crawford and Benny Golson."[6] The New Pittsburgh Courier thought that "the disc's lightest moment is provided by a charming duet with Phoebe Snow on 'A Lover's Question'."[12] The Houston Chronicle wrote that Rawls "has seldom sounded better, and his urbane phrasing is cut with just the right amount of downhome grit."[13]
The Philadelphia Inquirer declared that "it sounds amazingly retro, a kind of rhythm-and-blues time capsule that's closer to his classic early recordings than anything else in a long time."[11]The Times opined that Rawls's voice "has lost none of its velvet sheen."[14] The Colorado Springs Gazette-Telegraph called Portrait of the Blues "a contemporary blues masterpiece."[15]
AllMusic wrote that Rawls's "delivery and articulation give the songs an uptown flair."[8]