Your large-hatted gentleman is Taras Shevchenko.
The full set of 14 is shown in an earlier thread (about half-way down the 1st page):
https://goscf.com/t/9204The explanation follows:
"On 27 August [1919], the [Ukrainian] Government-in-Exile resolved to replace all existing postage stamps then in use on Ukrainian territories with a new definitive issue. This 14-stamp set became known as the Vienna Issue and contained values from one to 200 hryven. Designs for the 1-, 2-, 3-, 5-, 30-, 50-, 80-, and 200-hryven values were executed by the prominent Ukrainian artist Mykola Ivasiuk. The remaining value designs were based on photographs of historic places and portraits of prominent historical figures. These stamps, printed by the Austrian Military Geographic Institute of Vienna, Austria, were completed towards the close of 1920. None of the stamps from this set were ever circulated postally despite published reports claiming otherwise."