All I-3s appear to be painted in a standard Soviet scheme of that era with dark green wings upper surfaces and the whole fuselage and light blue wings and stabilizers undersides. The duralumin cowling panels are left unpainted.
Red stars are positioned on both upper and lower wings. Stars of three types could have been used - a plain red star, a star with a black outline, and a star with both black outline and black circle. In most cases it's not possible to determine the exact type of the star from the photo, and while the black outline/black circle type is the most probable, two other types are also possible. All three types are provided in the decal sheet.
It looks like the stars on the rear fuselage are always placed in the same standard position. While some photos seem to prove otherwise, this is most probably due to the distortion caused by the fact that the aircraft's side doesn't face the camera directly. To illustrate this effect I have used my old I-3 model to reproduce the similar camera angles.
Except for one photograph, the type of the fuselage star is also impossible to determine. Three types are provided, with a black outline + black circle type being the default.
These are the actual painting options provided in the decal sheet:
|White "2" captured on the footage from a military parade in a row of other I-3s with similar white chevrons.|
|Red "7" from the same parade.|
|Another I-3 from the same lineup. This aircraft lacks a number, but wears chevrons on both it's rudder and fuselage.|
|White "1". This I-3 is distinguished by the red star on the front of it's cowling.|
|Red "4", another I-3 from "If War Comes Tomorrow". The spinner is probably red, but other colors are also possible.|
|White "7" from the famous, but blury photo.|
|This aircraft appears to be devoid of any markings. It's wing struts are painted a dark color, probably green, while the metal panel in front of the lower wing is left unpainted.|
I would like to thank Andrey Petrov and Sergey Trufanov for their help in decals development.