the black points could be holes, but also defects of the photo, there are many ones on the background.
The plane gives the idea to have at least 3 colors on it. I think that an original green/grey camo has been partially repainted with Soviet green and light grey. One could try to compare the scheme with the original British one, that was very standardized.
It would be interesting to hypothize a tropical camo, but the undersurface of elevator looks too light for British azure-blue.
The British number is only partially visible, but one could attempt a profile or a model all the same.