This is a open reference for writers and artists looking for a consistent base to portray a more uniform mythos intended to be used by anyone working with my company Arkham Antiquities.
I personally find extreme cases of the "Innsmouth look" more fantasy and less horrific. The horror is in the subtle uncanny valley effect, and they could not keep this secret if they all had fish heads.
Plus at least 75%-80% are "normal humans" in Innsmouth with little deep one traits or none at all, that's why the deep-ones have a covenant with them. To breed, but they all eventually leave...the humans keep breeding with humans after all, they only must bear one hybrid and that's not anything romantic..
So my reference is for a hybrid, with heavy atavistic traits moving towards full deep-one. Some hybrids may stop in a intermediary stage and get an extreme case of the Innsmouth Look.
It's just a photo manip and redraw of a Human Skull and that of a Wolf-Eel, based on images from Skulls Unlimited. I plan on buying a skull of each for a basis to build a deep one skull someday...