And don't forget Uncle Mike's fishmen. They are my personal favorites for Deep Ones I've found through the ranges- and I am familiar with all the ones mentioned here prior.
But you're right about the lizardy look- a lot of them seem too reptilian and not well, fishy enough. The classic look in my mind are yes those masks you presented in the OP, but also the Koa-Toa from Dungeouns and Dragons.
Sorry if that reference is a little too far out, but I find in a string of a lot of my conversations having both persons knowledge of DnD seems to really ease the flow of conversion...
"What does it look like?"
"Like an ettercap. You know what what an ettercap looks like right?"
"Yes I know."
"Ah, well then- that was easy..."