Create RM2k facesets like the RTP ones. Stick to a square resolution since that's what it uses. Scaled down to 48x48px like the original assets, they blend in pretty well.

Avoid using quality tags. I'm not really sure why, but the effect really only carries through with Illustrious-XL v0.1 at the moment. I'll have to look into what's causing this.

It seems to need higher weights. 1.2 to 1.4 is a good starting point.