"Dahl's stylistic distinguishing mark are his carefully arranged compositions in the sense of the Schirmer school, with graded backgrounds, a vespertine atmosphere in the sense of Romanticism and the smooth and fine execution of details. Owed to the time-consuming making, the small oeuvre is no surprise. Early works already show Dahl's preference for an elevated perspective onto scenes crossed by distant creeks, rivers and lakes. Alongside mere landscapes he made romantic paintings of castles or ruins. At times he does entirely without any stafffage, whereas other paintings are inhibited by single figures." (Carsten Roth, AKL).