Hi, Leigh. Thanks for the detailed comment.
I can see what you mean about the mouth. I tried to model him with a neutrally-opened mouth so that I could easily model the teeth, gums, and tongue. I was trying to get a neutral expression in case I wanted to rig him in the future, but after making faces at a mirror for a few minutes I think I see the problem. Apparently, getting the corners of the mouth that low involves a lot of neck muscles which just isn’t present in my sculpt. For now, I think I’ll make the mouth more neutral since I was planning on working on the facial expressions as I worked on the pose.
As for the textures, may I ask if they look low-res in general or are there specific areas where they look low-res? I used blended box mapping and procedural textures for most of the current update, and it’s a new workflow for me, so I’m still fumbling all over the place. I checked my textures and the smallest one is a 1k tileable texture. I think I may have scaled one of the smaller ones too large. Fortunately, it’s an easy fix is this is the problem.
I did a test bake for the diffuse map of one of the foreground elements. This is what it looks like baked to an 8k texture:

(noticed a few UV problems on this one)

Again, thanks for the reply. It was really helpful.