I think Black Warrior Review covers make the pick every issue, with Luanne Redeye's (Self)Image on the Fall/Winter 2016 cover just another example of why. More from her "Genre Paintings 2011 - " series can be found inside the publication, as well as here on her website.
The cover of The Massachusetts Review (v57 n3) features Nina Chanel Abney's What, 2015 (unique ultrachrome pigmented print, acrylic, spray paint on canvas). More of her work is also featured in the publication and can be viewed in her online portfolio here.
The cover of the seventh issue of Subprimal Poetry Art features Three Shadows by Kate Viola, who says the painting was "inspired by the haunting arias often found in operas." Subprimal Poetry Art is a open access online publication of words with music, words alone, and artwork.