It sounds like you have a handle on several of the things that need touching up, including the strange illusion that Picard's right arm has two elbows. If you want to play up the symbolism of Picard's pose, you might work on the hands. Hands are sensitive things that a viewer subconsciously pays attention to. (Some of the sexiest photos of ladies include hands.) You have the start of something with his right hand open towards his leg, but his left hand. . . cupped up slightly. Consider drawing an extended metaphor of the Seal of the President (look at the eagle's talons and you'll see what I mean): Have Picard's right hand open but splayed a little bit, like the start of a handshake. And have his left hand be clinched like a fist.
Or. . . Have him do a perfectly Picard thing. Have him straightening his tunic. Both arms reaching back, tugging on his hem.
Now, I talk a good show, but historically I've actually done a somewhat lousy job with proportions. For most folks, I would recommend having someone photograph them at exactly the angle they intend to use, and then use themselves as their own model. But if you wonder why I've drawn people with short, stubby legs, it's because. . . well, I have short, stubby legs. And I tried the photographing-myself-in-the-correct-pose idea before, and the result was that my figures looked too much like me (even the girls). So
in doing my contest entry for March, I gave myself the challenge of doing bare legs, in proportion, using a gender other than my own.
Making a walking person look normal is
hard. It takes an understanding of the subtleties of balance -- specifically, what looks like a balanced person walking upright versus about to tip over on one side. You know how I harp on you about making your starships look balanced? It's harder with
people. When a person's walking normally, he or she swings her arms ever so slightly in alternation, side-to-side. (When you try to do it consciously and think about it, it gets harder.) But when he's using his arms in gesticulation, or when she's carrying a briefcase or a box or a grocery sack, the arms can't always swing the same way. So the stance changes to compensate, in subtle ways that you only notice when you're looking at a 3D animation of a person carrying a sack and something doesn't look quite natural.
So my suggestion is this: Get a camera that takes pictures in succession, with one of those "auto-shutter" features. Then photograph a man, or have someone photograph you, walking down the hallway from below-torso level, just the way you've intended here. Relaxed arms "hang" differently from stiffened arms, and it's here where you'll discover that your Picard looks stiffer than he should. His arms are splayed out, but his shoulders are flat as a slab, which takes away from the "freedom" posture I think you're going for.
Just don't photograph
me walking away, because you'll get these Yosemite Sam-like nubs that don't look the least bit like Picard.
As for color: It is true that the eyes move toward the part of a scene with the brightest, or most vivid, use of color. So the bright red uniform already helps you here, as does the fact that Borg garb is typically drab grey. But I'd be careful with desaturating selected areas because I think the result, in this case, would be contrary to your theme. A monochromatic background with a bright red person in the middle could be construed as a classic war propaganda poster. And it might even look good as that, but that's not your theme.
But here's where you can have a
kind of light at the end of the tunnel: Let the light be coming from a source directly in front of Picard, obscured by his body. And let him block that light in such a way that it creates rays and casts a shadow directly onto
us (the viewer). Let the light dance around his form and accentuate the bright, normal, and human-looking areas that make us see him as healthy and natural, like his hands, his cranium, his neck.
And let this light be the major source of light for the entire corridor, if not the sole source. As if someone beamed a flashlight his direction in a darkened spaceship and was yelling, "Captain, over here!"
DF "Just Don't Let J. J. Abrams Hold the Flashlight" Scott
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P.S. And just to show I wasn't kidding when I said my art projects sometimes tend to look like Paulina. . . Here's a sample from a quarter-century ago.