"Roll the Eye of Vecna and see the number in the pupil as it focuses on you." but it doesn't look like that. Seems like the eye simply turns to the plane of the viewport, which on the lower left edge of available space looks like this:

It's just looking past me at nothing.
I think it would make a significantly better impression of focusing on the user if it turned towards a point on the normal to the center of the screen.

Also i think that with this particular die it would be better to be thrown from sides to center so that it would end up somewhere in the middle