Question about painting ripperdactyls

Oh, guys. Sry for the question, but i really need your help and/or advice.
How can i make transparent effect (like on their box) on ripperdactyls wings?

I have the box right here, and don't see what you're talking about. Could you go into a little bit more detail, possibly?

There should be a feeling, that the sun is behind ripperdactyls, so their wings shine :3 I suppose, their veins should be darker than the main part of the wing. But i dont't know, how to mark them out(
If i cover the wings with white color at first and then apply thin layer another - there coould be such effect. But result was...pitiful.

Like this, but wings should be a little more bright.



PS: rly sry for mistakes.

Not sure if this is what you are after, but DancingWithSaurus painted their Rippers with similar patterns, and shared the recipe here (the very first post on that page; you can see the Rippers on the previous page):

http://www.lustria-online.com/threads/just-back-form-the-chaos-wastes.13640/

Hope that helps!