Visually pleasing (11)
I believe the answer is:
picturesque
'visually pleasing' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for picturesque that I've seen before include "Pretty -- quaint" , "Charming to look at" , "Visually pleasing" , "Strikingly beautiful (view)" , "Attractive, scenic" .)