The candidates for the official portrait

Today my son A  helped to make the layers for the portraits that I took on last Saturday, The signs in the photos are some results of the research of professor K. I was so keen to see the results that late in the evening I went to print the photos and here they are.  I think that the left one is the official candidate to the  wall of a lecture hall and the right one is for more relaxed use to the walls of the department.