Career
Warren lived first in London, then later in Chudleigh Devon, South-West England. He was acknowledged as the first landscape artist to be influenced by the pre-Raphaelites ideas of colour, meticulous observation of the subject, and attention to detail. He was also influenced by the English artist Richard Redgrave.
Working in both oils and watercolours, his work became very popular during the late 1850s to early 1860s, though critical reception was mixed with, for example, art critic John Ruskin denying that Warren was a true pre-Raphaelite because his landscapes owed more to "cleverly deceptive technique" than observation.
He also belonged to the Royal Institute of Oil Painters (Republic of Ireland). Warren"s paintings were characterised by evocative and Idyllic depictions of the English countryside, woodlands and harvesting scenes.