Ronald Wimberly's Variant Cover For 'Mighty Avengers' #3
I go back and forth on how I feel about variant covers, in terms of whether or not they're good for comics in general. But I'll say this much: the inclusion of variants can sometimes lead to great art we'd otherwise never see. Case in point, Ronald Wimberly's variant cover for Mighty Avengers #3, which is probably my favorite cover of 2013 so far.