The Collaborative International Dictionary of English v.0.48:

Picturesque \Pic`tur*esque"\, a. [It. pittoresco: cf. F.
   pittoresque. See Pictorial.]
   Forming, or fitted to form, a good or pleasing picture;
   representing with the clearness or ideal beauty appropriate
   to a picture; expressing that peculiar kind of beauty which
   is agreeable in a picture, natural or artificial; graphic;
   vivid; as, a picturesque scene or attitude; picturesque
   language.
   [1913 Webster]

         What is picturesque as placed in relation to the
         beautiful and the sublime? It is . . . the
         characteristic pushed into a sensible excess. --De
   Quincey.
   [1913 Webster] -- Pic`tur*esque"ly, adv. --
   Pic`tur*esque"ness, n.
   [1913 Webster]

WordNet (r) 3.0 (2006):

picturesquely
    adv 1: in a picturesque manner; "in the building trade such a
           trader is picturesquely described as a `brass plate'
           merchant"