Prompt
A close-up of a [marbled fluid surface] that fills the frame and is centered horizontally and vertically, with a tight crop and minimal margin so the pattern occupies the entire image area. The composition presents the subject as a full-frame texture with layered swirls, veined bands and graceful undulating flows, and the background proportion is effectively the same as the subject with no separate horizon or distant depth. Lighting is soft diffuse illumination from above that produces gentle separations between forms and subtle glossy highlights on the surface. Surface detail reads as smooth, slightly viscous layers with thin channels and [fine white speckles] scattered across darker channels for small-scale contrast. Color is biased toward [cool slate tones] with deep near-black shadows, mid steel-blues, and pale icy highlights that remain natural and neutral. Focus is shallow-moderate so the top surface and nearest veins are crisp while subtle falloff softens distant micro-forms, producing a tactile photographic texture. Render as clean photographic capture with minimal grain, faithful tonal range, and preserved micro-contrast so the image reads as an actual liquid-marble photograph.
