Here is an excerpt from that poem:
'On either side the river lie
Long fields of barley and of rye,
That clothe the world and meet the sky;
And through the field the road run by
To many-tower'd Camelot;
And up and down the people go,
Gazing where the lilies blow
Round an island there below,
The island of Shalott.
Willows whiten, aspens quiver,
Little breezes dusk and shiver
Through the wave that runs for ever
By the island in the river
Flowing down to Camelot.
Four grey walls, and four grey towers,
Overlook a space of flowers,
And the silent isle imbowers
The Lady of Shalott.
Lying, robed in snowy white
That loosely flew to left and right --
The leaves upon her falling light --
Thro' the noises of the night,
She floated down to Camelot:
And as the boat-head wound along
The willowy hills and fields among,
They heard her singing her last song,
The Lady of Shalott.
Heard a carol, mournful, holy,
Chanted loudly, chanted lowly,
Till her blood was frozen slowly,
And her eyes were darkened wholly,
Turn'd to tower'd Camelot.
For ere she reach'd upon the tide
The first house by the water-side,
Singing in her song she died,
The Lady of Shalott.
Long fields of barley and of rye,
That clothe the world and meet the sky;
And through the field the road run by
To many-tower'd Camelot;
And up and down the people go,
Gazing where the lilies blow
Round an island there below,
The island of Shalott.
Willows whiten, aspens quiver,
Little breezes dusk and shiver
Through the wave that runs for ever
By the island in the river
Flowing down to Camelot.
Four grey walls, and four grey towers,
Overlook a space of flowers,
And the silent isle imbowers
The Lady of Shalott.
Lying, robed in snowy white
That loosely flew to left and right --
The leaves upon her falling light --
Thro' the noises of the night,
She floated down to Camelot:
And as the boat-head wound along
The willowy hills and fields among,
They heard her singing her last song,
The Lady of Shalott.
Heard a carol, mournful, holy,
Chanted loudly, chanted lowly,
Till her blood was frozen slowly,
And her eyes were darkened wholly,
Turn'd to tower'd Camelot.
For ere she reach'd upon the tide
The first house by the water-side,
Singing in her song she died,
The Lady of Shalott.
From these 2 stanzas I derived the image of Elaine, as she floated down the river, dying, and having her energy, life force and blood drain from her body. As she passed the flowers by the towers, her blood drained down to the depths.