Those pre-raphaelites...I think I'd've liked to have been there.

the day-dream, by dante gabriel rossetti

The thronged boughs of the shadowy sycamore
Still bear young leaflets half the summer through;
From when the robin 'gainst the unhidden blue
Perched dark, till now, deep in the leafy core,
The embowered throstle's urgent wood-notes soar
Through summer-silence. Still the leaves come new;
Yet never rosy-sheaved as those which drew
Their spiral tongues from spring-buds heretofore. 

Within the branching shade of Reverie
Dreams even may spring till autumn; yet none be
Like woman's budding day-dream spirit-fann'd.
Lo! tow'rd deep skies, not deeper than her look,
She dreams; till now her forgotten book
Drops the forgotten blossom from her hand.

So the picture is called The Day-dream, which accompanies the poem above by the same name. The model is Jane Morris - she modelled for him A LOT. She was his muse - he was besottedly in love with her - she was also his friend, William Morris' wife...would love to know how that worked...