Two silhouetted figures stand beneath cosmic heart nebula

Digital composition employing gradient rendering technique with thermal color palette: core red-yellow gradient heart formation against deep teal-cyan upper atmosphere, dispersed star field with variable luminosity, foreground silhouettes positioned on darkened ground plane with grass vegetation line, atmospheric perspective establishing depth through color saturation degradation, dual vanishing point composition centering celestial phenomenon, subtractive lighting methodology creating luminosity contrast between figures and background radiation