Those just look like correct shadows to me. To be brighter - the materials themselves would need to be brighter; the ground would need to be brighter to bounce more light; you would need to fake it by adding an extra light that shines into the shadows; you'd adjust the position of the sun to be lower and at a different rotation so it shines more into that recessed area; you'd raise exposure (which would make the rest brighter, but this is just like real photography, if you exposed for recessed shadows, the exterior would become overblown); you could add some lighting in there that would match the real world (light bulbs, that the person living there turns on at night) and have them on. And so on.
All this is very good, but when I switched from VRay to Corona, at first I was very surprised that the Secondary GI Engine does not have Multiplier / Intensity to make the dead areas brighter.
TomG, yes, it looks like a real photo, but still the recommendations do not sound convincing, because for artistic reasons it may be necessary to adjust the dark. Therefore
mngereso, will probably help either Photoshop > Camera RAW Filter, or Ray Switcher inside Corona ;-)