Adjusted leg proportions, bones are pretty much equidistant now. I may experiment with adjusting the digitigrade bone structure a bit more and turn the knees and heels into proper hinge joints, but that's more of a me-being-a-perfectionist thing more than anything else.
Added visemes and eyelid blendshapes, mostly because it wasn't very realistic having the eyelids physically move left or right.. I've also added some blendshapes for doing emotes with, but I haven't yet set up the player controller to make use of them. That will be the next objective, unless there's any glaring issues that are picked up in feedback that I need to fix.
UV Map has not changed in this build. Your custom textures are safe, for now. :3
Also will need to add some more body customization, I'll have a bit softer variant for a blendshape, and I will also need to update some of the others to better fit the current proportions.
Haven't yet made a decision on what to do about the fins, would still ideally like to be able to have them with bones for some added dynamics, however, if people are happy with them being mostly static, then I'm happy to leave them as-is.
I may optimize the rig further to reduce the bone count some more, probably won't get them down enough for VRC to be happy, but that's okay. It may be feasible for me to target 32k tris, too, without sacrificing too much by way of quality.
Package is a bit bigger this time around, unfortunately. I have included a HDRI map from Poly Haven for a nice backdrop, which I've been using for doing my avatar portraits with.