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While I commissioned several art pieces depicting Gwen, none of them have the scar over her left eye that she canonically possesses. This one here is far and away the closest representation of her I've ever found. The eyes are supposed to be silver, but it's a minor point. Silver hair, silver eyes, scar over the left eye, a calm and calculating expression, and a face that could light up with joy, turn grim as death, or tease you until you retaliate.
[url=https://c1.staticflickr.com/3/2906/33100778514_4c4196ce37_o.png]Official character art[/url]
[url=https://c1.staticflickr.com/3/2871/9209208683_98e5704bd6_o.png]The very first commissioned render of Gwen[/url]

As for choosing a faceclaim for Eli, I would recommend one that's clean-shaven. The Immortals like to present themselves as pure and righteous, and facial hair doesn't reinforce that image.

EDIT 5/9/17: To be clear, there's no rule against beards. You can have one if you want. It's just Council tradition not to wear one.