The definition of the word artist is quite broad. It encompasses a wide range of activities related to creating, practising and/or demonstrating an art. Artistes, on the other hand, are public performers.
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nothing! both would describe as
The definition of an artist is wide-ranging and covers a broad spectrum of activities to do with creating art, practicing the arts and/or demonstrating an art. The normal meaning in both everyday speech and academic discourse is a practitioner in the visual arts only. The term is often used in the entertainment business, especially in a business context, for musicians and other performers (less often for actors). "Artiste" (the French for artist) is a variant used in English only in this context. Use of the term to describe writers, for example, is certainly valid, but less common, and mostly restricted to contexts like criticism.