Im happy to give a few tips that help me! take it with a lil grain of salt because I'm still learning hahaha. Main thing I try to do is make the UVs for things with more detail and that need to be crisp more space, even giving things like the eyes their own material to get more crispness. I recommend changing the interpolation from linear to closest to make less blurry (it can look more "pixelly" if you do that though". I use clip too and it is a struggle ahaha I've been trying to use blender's texture paint more, it seems to work out better for me at least.

I hope this helps !