So, what do you guys think?

I think the next step for you is to develop your understanding of the form of the face. As you were shading Marina's shoulders and torso, you had some idea in your mind of the form that things take, the mass they consume in space, the way surfaces of those mass reflect light. You thought about that.
You need to take that understanding with you to the face. You need to see the nose and the eye sockets and the lips and the chin as things that consume space. The problem many artists fall into when making sketches of photographs is that they train themselves to see objects as 2D shapes with outlines that are filled in. This is why art students are often told to sketch real people, 3D forms, right in front of them. This breaks them of the habit of seeing the nose as a line that leads from one eye to the next on a circuitous path like a rope.
My suggestion for your next exercise is to try drawing just the face. And try this several times. I know you're a Troi fan, so go ahead and use Marina's face, she's got a good one. But don't even think about hair or shoulders or comm badges. Just go for the contents of the head. Then as you're working, don't do any outlines. None. Tell yourself, nothing that I draw will be a hard line. Instead, hold your pencil at about 30 degrees to the paper and shade everything, zig-zags, scratches. Imagine Marina's face as if it were made of triangles, like she were a sculpture sitting on your desk. See in your mind the triangles between points on her face, like between her eyeballs and the tip of her nose, or between the base of her simian lines and the forward point on her lower lip. And shade those areas the way they catch the light.
At first, it will look a bit more like impressionism than realism, but there will be a point there Marina will emerge from within what you're drawing, and you won't be able to avoid capturing her in the work. Drawing is a lot more like sculpture than you realize, but when it hits you, it'll be pretty powerful.
DF "I Sense An Emerging Realization" Scott
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