@jendrzych Great job on recent icons update! Really like how Pivot Point and Transform Orientation popovers look right now 
But, one icon is very out of scope…
This Face Select icon looks like was accidentally placed here and don’t have any relation with two others.
And this choice obviously relates to changing icons style from 3d to 2d.
So, as an example, that’s how 3ds max 2d icons looks like:
They are a bit ugly, but pretty simple and descriptive in relation to each over.
The simplest solution to current icon set would be something like this:
But I’m still not sure that 2d shape is a good choice.