Hi Shane,
Yes, the occupations are from two seperate sources, they are both from his marriage certificates.
Frederick married twice. 1st in 1882, Charles described as Artist. Following his wifes death in childbirth he remarried in 1899, this time Charles was described as Picture Dealer. Both marriages took place in Liverpool.
I am presuming Charles was alive at this latter point as on other wedding certificates I have if a father was deceased it stated such, although I know that this may not always be the case.
Cheers
John