Contributed by Sharon Butler / I used to think about beginnings, doubt, and irresolution. Lately, though, in my own work and that of other painters, I’ve come to appreciate more rather than less paint on the canvas. It appears that Michael Krebber, now painting in oil, has evolved in a similar direction. In his eighth show at Greene Naftali, two large diptychs, Doll in Pink and La Poupe, look to question his once emphatic emptiness, manifesting more pronounced back-and-forth between layers, edges, shapes and color, more varied brushwork, and, overall, a more intense engagement with paint and brushwork.