"概念派艺术家" can be translated into English as "Conceptual Artist" or "Concept Art Artist".
"Conceptual Artist" is the most commonly used and widely recognized term, referring to artists who focus on the ideas, concepts, or theories behind their artworks rather than solely on the aesthetic or visual aspects.
"Concept Art Artist" is another possible translation, though it's slightly less common and might be more specific to artists working in the field of concept art (often used in game design, film, and animation to visualize initial ideas).
In most contexts, "Conceptual Artist" is the preferred and most accurate translation.