Jeni Weinberger owns or owned the "ART Salon" in Bath, so she would have had access to various talented artists who were capable of producing such a professional sketch, although a little caricaturish.
If she was a pro or talented amateur artist herself, it might have been her work.
I don't know what Mrs Weinberger was doing in 2007, but in 2010 she and her husband set up Diasolve Ltd, located in Porton Down in Wiltshire. That company was voluntarily liquidated in March 2019. The Art Salon was incorporated in 2015 with another woman, not with her husband. The Weinbergers appear to live in Marleborough, Wiltshire.
She saw a lot, Mrs Weinberger, but seemed to share her sightings with the McCann's investigators rather than the police. Here she is again;
Another witness, Jeni Weinberger, from Salisbury, Wiltshire, said she saw a woman resembling Mrs Albino outside the McCanns’ apartment in May 2007.
https://www.dailymail.co.uk/news/article-1255297/Riddle-Madeleine-McCann-fat-gipsy-women.html