Calling this done! 3d printed not-tyranid for my D&D campaign.
It's done because I've got two other primed but unpainted tyranids ready to go and that feels like more fun than working on this one any more, which is good enough for the table. This is the way.
Adding texture to flat areas doesn't have to be a scary endeavor, just remember: it's technically all flat, you're just tricking the eye. Just look for surfaces IRL that have the texture you're envisioning and apply them to your project's surface for awesome results!
For instance, a nearly-foolproof "marble" method uses stretched out baby wipes to mask a vein pattern; lightly spraying gloss varnish (or paint) on a surface and laying plastic wrap over it before it dries results in crinkly topography of your choosing that you can later drybrush to impressive effect.
Every single product out there that claims to be the perfect answer was first inspired by a DIY solution. Hell, even paint! 🤓🤘🏼
Yep the wings are citadel nazdrag yellow. Adding texture to flat wings though, man, I'm not sure. The guide I sorta followed adds a load of striations to the armour panels so maybe something like that?