Skydome rendered with Terragen:
Two suns; one large and cool the other small and hot shining through light overcast creating bright areas that cast twin soft shadows, those in the slightly red tinted light from the larger sun less well defined.
Shadows are mostly evident in shaded areas, in the open illumination is soft but with a distinct bright side. The twin bright points will show in reduced intensity reflections.
Lowered horizon, flat fractured rock ground viewed from a standing height of 1.7m but not obvious if seen from higher.
Note: Preview is mapped to Filmic colour space, emphasising the two bright areas.