You might already be doing this but I've found its best to have 2 versions of your figure in scene, one with shaders work applied, one with just the diffuse maps work plugged and no specular, nothing else. Both referencing the same work files. Selectively hide/unhide, use the reload textures render feature and have your OpenGL preview resolution set at a resolution that matches the largest texture size. Speeds up checking your work.

Don't skimp on effort with things that you might not find useful in your own work. Mouth interior, fingernails, lids punctum, those kinds of things for example.

See you in a couple/few months when you start painting makeups ;)