I'm thinking more caricaturist than a cartoonist - a quick portrait sketcher.
Census information can't be relied upon by itself - BMDs have to be cross-referenced. Parents sometimes forgot their children's birth places and true ages, especially if they travelled a lot, or if they were illiterate, or if they had many children. First names, middle names and nicknames were often interchanged on the censuses. Widows might have reverted back to their maiden names, or remarried, etc. Minefield!
Two Ridley children christenings seem to conflict with the census data:
THOMAS RIDLEY, christened 21/9/1862 at Doddington, Cambridgeshire [
not Cavendish, Suffolk?]
Son of John Ridley & Selina Ridley
https://familysearch.org/pal:/MM9.1.1/NTGZ-531LAURA ELIZABETH RIDLEY, christened 28/1/1869 at Tamworth, Staffordshire. Daughter of John Ridley & Selina Ridley. [This child should be with her parents on the 1871 and 1881 censuses, unless she died in infancy, or could this be "Grace"?]
https://familysearch.org/pal:/MM9.1.1/NB1T-WH2I can see 2 possible Grace Matthews on the censuses, 10 years between them:
(1) 1901 Census at London / Middlesex (Wandsworth) - Grace Matthews, aged 7, born in Bristol, grand daughter to the head of house
https://familysearch.org/pal:/MM9.1.1/X9HT-KL5[this one sounds like your Grace Matthews, born circa 1894 - so off the 1891 census]
(2) 1911 Census at Bridgwater, Somersetshire - Grace Matthews, aged 7, born in Bridgwater
https://familysearch.org/pal:/MM9.1.1/X7RC-LH8[this one b. abt. 1904 - prob. not directly related]
On the 1881 Census, I can see a 10-year old Grace Ridley, born Bethnal Green, although I can't find her christening around 1871 (unless she is Laura). This definitely sounds like your Grace living in a caravan with her family: head, John Ridley (42), wife Se?na Ridley (39), siblings Thomas (19), John (14), William (11), Charlotte (5), and Nettie (1).
https://familysearch.org/pal:/MM9.1.1/X3LR-KTNEmma and Rhoda were born later, according to the 1891 census.
Dad not to be confused with the John Ridley married to a Mary, on the 1871 census at Marylebone. Different children.
https://familysearch.org/pal:/MM9.1.1/VRJQ-ZF3Grand daughter Grace Matthews, b. abt. 1894 must be the daughter of one of the older Ridley daughters and a Matthews man. I think we can rule out Nettie, Emma and Rhoda, who would have been too young to have a baby in 1894, aged 13, 12, and 8, so that leaves Charlotte or Grace ... or the mysterious Laura.