Idiom of the day :- No oil painting

Usage, examples and definition of the Idiom :-

People who believe that oil paintings are only of pretty things should have no difficulty thinking that unattractive people or ugly things are no oil painting. ‘Martha’s a wonderful person, but you must admit she’s no oil painting to look at.’ ‘This is an interesting town, but it’s certainly no oil painting, is it ?’ Nellie said.