I'm very conflicted with the colors, because in one hand i want it to be bright and colorful to be nice to look at, and on the other i really love the natural, red-tinted brown color. Pls halp.
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My favo out of these is No.3 tbh. i like the marking-idea.
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Jungle's of Mhen'ga i was planning on. Hence i'm fearing that a certain color palette will make them too close to zil
Based on these three things and my own taste, I'd suggest picking #6 for the worker slut bugs, with maybe making the outlined markings it has a tiny bit more pronounced. The Royals - and the males, if the royals are Queens, as I assume is where you can really bust out something very colorful and bright, to accentuate the status difference and the fact that, unlike proletariat bugs, big lazy bastards don't need to hide from anything, or risk their lives braving the jungles.
As for size, 3-4 ft. seems like a good enough compromise between making them smol and not having to struggle too much with drawing them. It'll also be in-line with what we have for Ruskvel and Gabliani, allow for a TF item to be written someday. Most importantly, it'll stop some of us from having intense reservations when it comes to sexing those cute lil' things with our PCs' big mean dongers.
Since you have mentioned the Codex, can you gib us more deets about the race?
Lastly: thanks for making all this, and please do more cute!bug sketch mini-comics in the future.