Stand 7 x 3m; for the exhibition in Kazakhstan. One of the try.
There are plenty of space for improvement;, however, it is nice feeling that some materials became very good.
Mark, thanks for the advice. The "shadow catcher" is in use. The background is actually 2 colour gradient.
The "general illumination" (indirect light) is set from Light Probe and HDR file. (if I am not mistaken "preview.hdr"). What I found that dirty shadows, that appears in front of the image can be reduced by rotating HDR image for about 15deg.
Things that I am still struggling about environment: settings for environment illumination, set in LUX. If the "lock" is active, than position of the slider represents the multiplier (by default x 1.0); but if the "lock" is unactive, than Mstn suppose to calculate general illumination.
What is interesting, if lock is active (multiplier = 1.0), value of the LUX = 4700 (about that number), and rendered image become over exposed. Then is "unlock" the lock, and set the value manually to LUX=4700, the rendered images are different, the second image even brighter (unnaturally).
Experimenting with value, I found that for my machine, settings for environment illumination = 300 LUX is more or less acceptable.
Though, there are still lots to learn
You could use a shadow catcher material for ground material
Make a new material > color nearly whiteGo to the Material Editor > expert tab and turn of the option Visible to EyeAttach the new material to the ground material (a shape)Use white for background color