Lightmass: multi-bounced sky lighting

Hello guys… im new in unreal engine 4 !! i used to be good in Vray maya 3dmax mental ray smalluxgpu blender etc.
Im still learning the beginners stuff but im not new to the concept . so i will learn fast. the thing is… to create such realistc results i found out you can tweak the following things.

-OBJECTS lightmap resolutions ( normaly people tend to put it in 512 or 1024 )
-Direct Light parameters ? ( dont know witch ones )
-Skylight Parameters ? ( dont know wich ones )
-change de INI FILES. ( there are some tutorials around that to make the calculations go BRUTE FORCE . so its not good and i think it has been replaced with LIGHT PORTALS inside the actual scene … am i wrong ? )
-WORLD SETTINGS ( Lightmass settings - static light scale ( normaly people put it in 0.15 ) , NUm indirect lightning bounces ( 20 is good i guess ), indirect lightning quality ( 15 to 20 is good right ? ) and indirect lightning smoothness ( i allwyas put it to 0.6 ).
-and now i found this UNREALLIGHTMASS.exe file that replaces the old one witch aparently makes more bounces for skylight ( am i wrong ? )

Please if i miss something can you point out to me ?
the level of light im looking for in my work is this: https://ue4arch-ziqfn0zfhxoy.netdna-ssl.com/wp-content/uploads/2015/04/still_04.jpg

thanks guys , been learning so much in this forum with you people.