Discussion of the Konstellations

[RavenMM]

Now, one more thing: what about the hand on the (viewer's) left?

It seems she's the only nymph that's drawn with her palms up, doesn't it? Also, they mostly have at least one hand touching their hip. 

You seem to already have a hypothesis about what this nymph represents with all these memonics, and as i have basically no idea about constellation myths myself, what do you think?