The fourth version of the logo allows for declension based on common rules of the Russian language.
Looking at what letters we have already.
Polishing them and drawing the missing characters.
We have to obey the rule: the letters used in the logo can’t change. Testing the result.
The client does not like the strong dynamics of round characters. Trying to “calm down” their shape.
Trying to imagine how the face will look in real life.