Thanks @ Pastean_Narcis_Dan your post regarding grass was very timely 
. I was just trying to figure out the whole particle system process.
I made some modifications using the bmesh-clean addon and super-texture add-on.
The grass and dof is done following the quick grass on Eevee tutorial. The trees are made using the Botaniq Lite version addon
Hopefully, soon I will get to modify the light, reflections and AO Eevee/Cycles mix in the compositor
.