Sidney Ransom b 1876 Pimlico Artist
Ena Ransom wife b 1874 Basingstoke Actress
Doreen Ransom dau b 1894 Clapham
Living at 49 Crewdson Rd, Lambeth
RG13 420 146 48
Sidney and Ena's occupations match exactly with what you've told us. So does the name of their child.
Possible marriage in June Qtr 1893 Lambeth Volume 1d page 879
A Sidney Ransom and Ena Lewis appear on the same page.
This also fits, because it introduces the name Lewis into the equation and perhaps explains why Sidney Ransom was also (according to google) known as Sidney Lewis-Ransom.
An 1893 marriage would also 'fit' with the apparent birthdate of the child on the census - c. 1893/94
BUT this can't be the Sidney you refer to, because it makes him only 12 when he married

At the moment I'm going round in circles I'm afraid.