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Hello! It's been a long time since the last update, but I finally found some time to continue working on this model. I refined the high-poly version and created a low-poly model with around 11.6k triangles. Here’s the result after baking the maps. The mechanical arm is split into separate pieces for animation.

Have you heard of the loomis and Asaro methods? Of head construction.. should help with planes of the face  switching between 2D and 3D might help you there.. I would suggest spending time on areas away from heads like anatomy, musculature, texturing anything else at all that will help improve other areas.  When you do circle back to heads I strongly suggest studying the tissues and muscles bone structure of the human head not just a visual sculpt from pictures unless you're already doing that  try to reconstruct a human head in all of it's anatomical parts under the skin.  Something over looked is that blood fluids, fats etc change the shape of a face in subtle ways..  A person upside down looks different from their right side up counterpart

Seriously good stuff keep up the good work

sorry for not getting back earlier, what i meant is that you introduce mechanical looking patterns be having always the same distances and sizes of things.

but besides that, i feel like that you are polishing things too early and often, trying to get a clean result, cleanlines that seem to go on forever. which can be a style choice of its own but looking at the reference i dont think is the way to go.

i do wonder if it would be benefitial for you to cut back on brushes and tools for some time, step down a subdiv level or two and work exclusively with a clay (or claytubes) brush. dont use smooth, dont use i dunno dam standard or pinch. do all the shape buildup and take aways with clay, polish with clay. be lose, be messy, be organic