I don't have the graphic artist skills to do much, but I very much have a mental vision. Personally, in addition to the metals, we have a very obvious progression when it comes to the wings. a 2-4-6 pattern is screaming to be used here.
Also, I think the artists should be able to branch out with the color palletes and designs. Pseudos like Dratini and Pupatar don't always follow a strictly natural progression. (though a Bug line already has a larve/Pupa feel to it, it would also be nice to see experimentation with different options)
If there is one element that I think should be the head. For some reason the psychic type keeping the same brain or something just appeals to me.
Quanyails, nice work, it does indeed look on the right track. And is it just me, or do I sence a bit of inspiration from Tremors?