Brief a painterly concept-art illustration on Flux.1 [dev], not a photograph

SUBJECT AND SCENE
a lone airship drifting between towering red-rock canyon walls at dusk, tiny lights visible along its hull

MEDIUM
This must render as traditional gouache and ink concept art, painted on textured cold-press paper, not a photograph and not a photorealistic digital render. State this as a positive fact about the image's actual material surface, since Flux's strong default lean toward photographic realism will otherwise reassert itself even after a style is named loosely — the medium has to be described as concretely as a camera and lens would be for a photo brief.

BRUSHWORK AND SURFACE
visible loose, confident gouache brushstrokes with hard ink line reinforcement at key edges. Visible texture matching that brushwork should be evident across the image, especially in the canyon rock faces and the sky, where large flat brush passes should be clearly readable, the way an actual painting shows the physical marks of how it was made.

COLOR PALETTE AND LIGHT
dominant burnt-orange and deep indigo, with the airship's small hull lights as the only warm-white accent. Concept art typically commits to a much more limited, mood-driven palette than a photograph would — describe the two or three dominant colors and how light and shadow are handled within that limited range, rather than full photographic color fidelity.

REFERENCE STYLE
the loose, confident brush economy and high-contrast silhouette work typical of golden-age film concept art, not a tight, airbrushed digital-painting finish. Use this as a description of technique and sensibility — brush size, edge treatment, level of detail versus suggestion — not as an instruction to copy a specific living artist's identifiable signature style; describe the qualities that reference implies rather than naming it as the sole instruction.

COMPOSITION, FOCAL TREATMENT, AND FINISH
the airship rendered with the most linework detail, the canyon walls suggested with broad, looser color shapes, and the frame's corners left with visible unfinished brush edges, the way a concept sketch intentionally doesn't resolve every edge. Concept art typically uses a clear focal hierarchy — one area rendered with real detail, the rest suggested with looser, more gestural marks — rather than the uniform sharp-everywhere detail a photographic brief would ask for, and it is often left with an intentionally unresolved edge or two rather than a fully finished border.

WHAT THE IMAGE SHOULD NOT LOOK LIKE
Because there is no negative-prompt field, state this positively: the entire image should read as the stated medium throughout, including the subject itself — no photographic skin texture, no camera lens characteristics such as bokeh or chromatic aberration or film grain, and no photorealistic material rendering anywhere in the frame.

IF THE RESULT STILL READS AS PHOTOGRAPHIC
If a first attempt still shows photographic lighting or material rendering underneath the named medium, that's a sign the medium and brushwork_description need to be described even more concretely rather than restated more emphatically — naming an additional specific technique detail (a described edge quality, a specific way highlights are rendered as flat color patches rather than a gradient) usually resolves this more reliably than simply repeating "not a photograph" a second time.

CHECK BEFORE FINALIZING
Look specifically at how highlights and reflections are rendered on any smooth or reflective surface in the scene — photographic rendering shows a smooth gradient falloff, while genuine painted media typically render a highlight as a distinct, separately-placed patch of lighter color with a harder edge, and this single detail is often the most reliable tell of whether the medium instruction actually took hold.

OUTPUT
One illustration that a viewer would immediately identify as painted or drawn concept art, not a photo run through a stylistic filter.