I think I went a bit too heavy handed on the fine details, which I've noticed seems to be a common theme and bad habit of mine that I need to watch for. Next week I'll be cutting back on that & smoothing shapes to regain the larger chitinous plates that were present last week.
That said, the finer details will be helpful in making the shapes of the larger plates more accurate to how the skin and plates articulate.
Yeah, the black outline are ray misses/artifacts. Basically means that your LP has too much of a discrepancy/gap to your high-res mesh. It's much more visible with a metallic and specular material, like what you have applied in marmoset. However, because a lot of the material would be polymer/matte, it wouldn't be as visible; especially once textures are applied.
I'd not worry too much about it. If you really want to solve it, just make sure your lp vertices are snug against your highpoly to reduce that issue.
you can disable color space manipulation when opening files in the color settings
I'd advise that if you're doing anything with normals or other 'maths' textures (roughness etc) as photoshop will apply (and save) transforms, you won't know about it and suddenly what you thought was a value of 127,127,127 will actually be 141,141,141
photoshop isn't doing anything objectively wrong apart from not warning you about it - its just not aimed at working on images that want to be manipulated in linear space .
I purchased this add-on a few days ago. I’ve encountered an issue where applying the plugin changes the rotation of parts. I’ve tested this on simple geometries. I’m using Blender version 4.0.2.