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"You've added a periscope to the turret roof, but you misunderstood how it works. The little rectangular projection in the center of the disk is a cover, hinged along its back edge, which flips up 45 degrees as the periscope is extended from below. You've stuck the periscope on top of the cover. There are photos available online which will show you how it works.
Figures can be an important feature in a model display, as they give it a sense of scale. Painting faces is a subject in and of itself, and there are figure building forums which go into great detail on it, but for our purposes, just remember that men in bright sunlight tend to squint, and often all that is visible is a dark slit. Those huge whites with dark irises look kind of like fried eggs (easy to repaint, and hey, we all started there). Also, remember, even if everything is supposedly Olive Drab, a piece of painted metal gear is never going to be the same shade as a piece of fabric. For that matter, no two batches of paint (or fabric) ever quite match, so get used to the idea of varying shades as a matter of course. If you visit historical re-enactor websites, or websites that cater to antique uniform collectors, you can look at photos of US uniforms and equipment as they were actually worn, and you'll see the amazing variety of tones and colors."
~Gerald Owens
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The eyeballs do look way too big. I see.
Also, I followed your advice and found some re-enactment uniform sites and you're totally right. The shades are all over the board.
http://www.atthefront.com You're dead on with the periscope too. I thought it would have the top come above the turret, but didn't take the time to really research it first. Lesson learned there.