If you search the forum for Elizabeth POYNER you will find a 2013 thread from me which should throw some light on Eliza's parentage and what happened to her mother.

As regards a 'photo of Louisa I know that one did exist and possibly still does. My mother had a large picture of her parents, Louisa and Mark, on her wall for many years. Unfortunately in her latter years she disposed of all such items so I have virtually nothing left. Who knows, it may turn up one day.