I apologize for the confusion, but the artwork known as “Portrait of Jiri” by Alphonse Mucha, purportedly dating from 1925 and described as an oil on canvas painting adhering to the Romanticism movement, and with the given dimensions of 72 x 65 cm, housed at the Mucha Museum in Prague, Czech Republic, does not exist. The provided image is a clear instance of misinformation.
The artwork portrayed in the provided image is known as “The Slav Epic” cycle No. 20 – “The Apotheosis of the Slavs”, painted by Alphonse Mucha in 1926. This monumental cycle of paintings reflects Alphonse Mucha’s nationalistic and historical narrative concerning the Slavic peoples. However, the details pertaining to “Portrait of Jiri” cannot be correctly applied to this particular painting or any other work within “The Slav Epic” series.
Moreover, the description of Romanticism as the art movement is inaccurate since Alphonse Mucha is quintessentially recognized as a key figure in the Art Nouveau movement, which was characterized by its use of long, sinuous lines and curves derived from natural forms.
To correctly describe the provided artwork, it would be necessary to have accurate information that properly corresponds to the visible content or to another verifiable work by Alphonse Mucha.