Let me try to summarize information about the two extremely rare Yak-9s decorated with jaws drawings:
1.
Yak-9 flown by Mihail Semyonovich Mazan.
This Yak-9 belonged to 85 giap. During 1944 85 giap and its parent 6 giad moved several times from front to front: From Dec 1943 to Feb 1944 it was on 4th Ukrainian Front on Dnepr river. Then it participated in the Liberation of Crimea in April-May 1944. In July-August it was transferred to 1st Ukranian Front and participated in Lvov-Sandomir Operation. In October 1944 it was sent back on the 2nd Ukrainin Front in Hungary. 85 giap finished the war fighting in Austria and Czechoslovakia.
In Sept 1944 85 giap was rearmed with new Yak-3s, Mihail Mazan was killed in action in December 1944 while 85 giap fought in Hungary. So, the photo above was probably taken in spring or summer 1944, before the regiment had been rearmed with Yak-3s.
In post war memoirs by D. Panov, Mazan's Yak-9 was described as a "huge crocodile with its mouth wide open and with white teeth, yellow eyes and splayed legs with white claws"
2.
Yak-9 flown by Abrek Arkadevich Barsht. Barsht was a distinguished recce pilot (technically not an ace since he ended war with 4 victories (newer research shows only 2 personal victories) awarded with HSU red star in 1945.
Barsht flew with 118 okrap. From April 1944 to May 1945 118 okrap fought on 1st Ukranian Front, within the 2nd Air Army in Western Ukraine, south Poland and in Germany during the advance to Berlin.
According to A. Stankov, sometimes at the end of 1944 (Nov-Dec 1944???) Barsht received Yak-9 with tactical number "13" and while flying this plane he scored a victory over a Fw-190D9 south of Lvov. According to A. Stankov, Barsht's Yak-9 No "13" looked something like this:
Stankov's profile is obviously derived from the following photo:
judging by heavy coats, winter 1944-45 is the correct date for the time when this photo was taken.
Following two photos almost certainly also show Barsht and his Yak-9 (definitively not Mazan and his Yak).Jaw drawing is now outlined with thick white line and eyes are added. Judging by uniforms photos were taken in spring or summer 1945.
HTH,
KL