One of my biggest problems is impatience. I have no patience with working on the same picture enough to actually finish it.
Let's look at my Dina series. This is "finished work" as far as I'm concerned, but they really are nothing more than sketches.
Nevertheless... It perhaps should be something like this:
Botticelli: Discovery of the murder of Holofernes
John Opie; murder of (David) Rizzio
Interestingly enough, both paintings are very similar... using mainly red, white and a lot of shadows, black and dark shades, big contrasts and a lot of cloth...
Another interesting thing is that Dinah is not an interesting subject to paint.
Perhaps something like this?