Mothra is a mostly benevolent kaiju, dubbed the "Queen of the Monsters", akin to a goddess.
In this interpretation of Shin Mothra, she is less friendly.

Glowing cyan represents accumulated venom, this venom runs through her entire body, hence the glowing veins under her exoskeleton.

Most of the venom is accumulated in her wasp-like stinger, as well as her mantis-like mandibles and pincers. The edges of her wings have a thin veil of venom as well - if an enemy kaiju gets too close, she can brush her wings against them, and they'll immediately feel intense pain from the venom.

Her first pair of shoulders and forearms contain a potent poison - if an enemy kaiju tries to bite her, they could be unlucky enough to bite into the poisonous parts and suffer from the toxins.

Her wings are large and thick. It sports a pair of glowing red eye patterns on the forewings for intimidation purposes. Subsections of her forewings resemble scales and capillaries, resembling fiery red eyes in the night sky (also bearing resemblance to Godzilla). There are an additional 2 pairs of glowing cyan eye patterns on her hindwings. Thick fur lining her wings helps her glide silently through the night sky. Her tough exoskeleton, a composite of keratin and chitin, allows her durability and versatility, making her hard to incapacitate.