Possible Clues:

• The Monarch of the Glen painter
• Instigator of luminarism, as well as visionary artist
• Victorian animal painter
• Get Sibyl a painter
• A slender model for an artist
• Sir Edwin -, Monarch of the Glen painter
• Artist always associated with pointless painting
• His 23 down may have been to look at the ground for animals
• Artist who can't visualise seascapes?
• This painter was a learner and a visionary