Funny that it'd be the light part of the shield - I figured that was one of my sloppiest works (It's nothing more than a hair/fur overlay adjusted to be pale, with another overlay to dirtify and such it). I assume you mean the color more than the pattern atop the white parts of the shield?
I'll see about lightening it further, but I have to admit there's a sense of weirdness about having such light colored leather. Most stretched rawhide I've seen is that near bone white shade, but applying it in the context of a cuirass feels very weird. Then again, a "Linothorax" (actually leather spolas) was probably just that, rawhide leather. Which would explain the pale color, I guess!
I'll have to read over leather in antiquity further. Checked the dissertation I was reading and the author said for some source (I assume Nuzi) the rawhide scales all were painted or lacquered on the outward side. I cannot imagine that anything but the poorest of folk or 'barbarians' wouldn't have applied wax, paint, or lacquer. In fact that makes me wonder about applying some unique painting to the leather, too. I assume if it were lacquered I'd be able to justify the darker brown or red brown color - Samurai's picture being an example of lacquered rawhide (and most of the modern rawhide scale or lamellar pieces I'm seeing are that brownish or red shade, and I am assuming that many of them are using actual rawhide).
To Summarize for clarification, Merlkir:
1) If I want it to be pure, untouched rawhide, it needs to be like the light parts of the shield.
2) If I want it to be lacquered rawhide, it could easily be what I have right there, or even what I had earlier with it being reddish-brown?
3) Would lacquered leather be able to be shaped into two broad bow shaped plates (think a lorcia segmenta, except joined at either side rather than front and back)? In other words, lacquered leather could be shaped into segments like in the picture.
And in your experience did anyone use untouched, not lacquered or painted rawhide for armor? Or for shields?