Here's a tip - because the covers are black in preview, it makes posing the eyes difficult.

Rather than hide the covers, which means you may forget to show them again before rendering, change the Element Display Style on the covers to wireframe.

Another tip - load a primitive and have both eyes "point at" the primitive. Now you can move where they eyes point easily by moving this primitive around. Make it hidden during rendering.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)