Raeburn from Memory

My attempt at painting "The Reverend Robert Walker Skating on Duddingston Loch" by Sir Henry Raeburn entirely from memory. How wrong can you get?
Original here en.wikipedia.org/wiki/File:The_Skating_Minister.jpg
For the "Masterpieces from Memory" group www.flickr.com/groups/artfrommemory/
Gouache A4 size.Click to enlarge.