Thank you for replies and advices! I see the problem with lighting and I’ll try to fix it in the next iteration. By the way, the customer has approved the main concept 
Together, we have rethought some details and now the reception will be bigger and guests will wait in separate area - not in the passage.
Also, they want “something special” in design that guests will talk about with their colleagues. And, as always, it must not to be too expensive or too difficult in servicing. I think, that I found something and will show it this weekend.