The editors of the Library Edition
describe the image as a “sketch of two windmills on an eminence, overlooking a wide plain”
(Ruskin, Works, 2:343 n. 2).
The vignette refers to the windmills on the hilltop, where the speaker climbs to view the surrounding plains,
according to the prose section following the drawing
(" target="_self">“When shall we get up this hill” [“Cassel”, prose]).
In the drawing, two figures, one seated and one standing, gaze at the prospect.