Steampunk island fortress with concentric circles surrounded by turquoise ocean

Digital painting employing aerial isometric perspective rendering a constructed island stronghold. Primary structure features ornamental steampunk architecture, brass-colored metallic mechanisms, and radiating concentric circular patterns in ochre and rust tones. Surrounding turquoise ocean contains scattered rocky outcrops, salvaged vessels, and atmospheric cloud formations. Compositional arrangement emphasizes geometric symmetry through central circular mandala design dominating the landmass. Technical rendering combines warm earthy palette against cool aquatic backgrounds, creating volumetric depth through shadow modeling and atmospheric perspective graduated from light cream to teal saturation.