4 - Let us activate 'GI'

5 - Since I used 'direct light', I had no shadow problems and for that reason I selected the 'low' option on the 'irradiance map'.

6 - The 'HSph subdivs' and 'Interp subdivs' options prevent the 'smoky' (or whatever it is called) effect that appears on the render.

7 - By clicking the options shown by the number 3 on the picture, we can see the 'prepasses' during the render process.

8 - If we want to change the place of just one model or add a few more details and render again, we can save the 'prepasses' by selecting 'save to file' in the 'irradiance map' section.

We can access the saved file by clicking 'browse...' but to use this, we must select the 'from file' option first.

9 - From the 'environment' section, let us adjust the 'sky light' values

10 - Let us activate 'shadows'.

11 - Let us adjust the light values.

12 - Since the light is sunlight, let us make it somewhat reddish.

13 - We can adjust the intensity of the shadows in 'shadow parameters' section. Since both my light sources lighten up the shadows, I increased the shadow intensity.

14 - Let us select 'invisible' and thus prevent the light source from being seen during render.

15 - Let us adjust the light values.

16 - To give some brightness to the scene, let us add some greenish colour to the light.