One who dabbles in fine arts for the love of it and not for monetary gains

One word substitute is Amateur.

Connoisseur: an expert judge in matters of taste.
Amateur: a person who engages in a pursuit, especially a sport, on an unpaid rather than a professional basis.
Professional: relating to or belonging to a profession.
Dilettante: a person who cultivates an area of interest, such as the arts, without real commitment or knowledge.