Thanks for comments !
Yes Prykie I keep it going, just see below please.
nzjimmy2001, thanks. I moved from YafRay (version 0.0.9) to its successor, a complete rewrite named Yaf(a)Ray because YafRay is no longer maintained and so the 0.0.9 wil be the last one. Main settings for Yaf(a)Ray are resumed at bottom of pictures.
spitty3d, thanks ! Not perfectly accurate, I should already open a todo list
Here's an update.