A Ratio, Not a Measurement
35:45 shape with the face filling 70-80%.
Most visa guidance gives you millimetres. Russia's unified e-visa does something different: the portal says the photo must be rectangular with a 35x45 aspect ratio, and that your face must take up 70 to 80 percent of it.
That is a considered choice rather than an omission. The e-visa is submitted as a file, never printed by you, so absolute size means nothing — what matters is the shape of the crop and how much of it your face occupies.
The two figures agree with the familiar passport-photo geometry. A 32-36mm head on a 45mm-tall frame is 71-80% of the height, which is why a correctly cropped Schengen-style photo generally satisfies this rule already.
